Mercury poisoning

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Mercury poisoning
Other names: Mercury toxicity, mercury overdose, mercury intoxication, hydrargyria, mercurialism
The bulb of a mercury-in-glass thermometer
SymptomsMuscle weakness, poor coordination, numbness in the hands and feet[1]
ComplicationsKidney problems, decreased intelligence[2]
CausesExposure to mercury[1]
Diagnostic methodDifficult[3]
PreventionDecreasing use of mercury, low mercury diet[4]
MedicationAcute poisoning: dimercaptosuccinic acid (DMSA), dimercaptopropane sulfonate (DMPS)[5]

Mercury poisoning is a type of metal poisoning due to exposure to mercury.[3] Symptoms depend upon the type, dose, method, and duration of exposure.[3][4] They may include muscle weakness, poor coordination, numbness in the hands and feet, skin rashes, anxiety, memory problems, trouble speaking, trouble hearing, or trouble seeing.[1] High-level exposure to methylmercury is known as Minamata disease.[2] Methylmercury exposure in children may result in acrodynia (pink disease) in which the skin becomes pink and peels.[2] Long-term complications may include kidney problems and decreased intelligence.[2] The effects of long-term low-dose exposure to methylmercury are unclear.[6]

Forms of mercury exposure include metal, vapor, salt, and organic compound.[3] Most exposure is from eating fish, amalgam based dental fillings, or exposure at work.[3] In fish, those higher up in the food chain generally have higher levels of mercury.[3] Less commonly, poisoning may occur as a method of attempted suicide.[3] Human activities that release mercury into the environment include the burning of coal and mining of gold.[4] Tests of the blood, urine, and hair for mercury are available but do not relate well to the amount in the body.[3]

Prevention includes eating a diet low in mercury, removing mercury from medical and other devices, proper disposal of mercury, and not mining further mercury.[4][2] In those with acute poisoning from inorganic mercury salts, chelation with either dimercaptosuccinic acid (DMSA) or dimercaptopropane sulfonate (DMPS) appears to improve outcomes if given within a few hours of exposure.[5] Chelation for those with long-term exposure is of unclear benefit.[5] In certain communities that survive on fishing, rates of mercury poisoning among children have been as high as 1.7 per 100.[4]

Signs and symptoms

Common symptoms of mercury poisoning include peripheral neuropathy, presenting as paresthesia or itching, burning, pain, or even a sensation that resembles small insects crawling on or under the skin (formication); skin discoloration (pink cheeks, fingertips and toes); swelling; and desquamation (shedding or peeling of skin).

Mercury irreversibly inhibits selenium-dependent enzymes (see below) and may also inactivate S-adenosyl-methionine, which is necessary for catecholamine catabolism by catechol-O-methyl transferase. Due to the body's inability to degrade catecholamines (e.g. epinephrine), a person suffering from mercury poisoning may experience profuse sweating, tachycardia (persistently faster-than-normal heart beat), increased salivation, and hypertension (high blood pressure).

Affected children may show red cheeks, nose and lips, loss of hair, teeth, and nails, transient rashes, hypotonia (muscle weakness), and increased sensitivity to light. Other symptoms may include kidney dysfunction (e.g. Fanconi syndrome) or neuropsychiatric symptoms such as emotional lability, memory impairment, or insomnia.

Thus, the clinical presentation may resemble pheochromocytoma or Kawasaki disease. Desquamation (skin peeling) can occur with severe mercury poisoning acquired by handling elemental mercury.[7]


The consumption of fish is by far the most significant source of ingestion-related mercury exposure in humans, although plants and livestock also contain mercury due to bioconcentration of mercury from seawater, freshwater, marine and lacustrine sediments, soils, and atmosphere, and due to biomagnification by ingesting other mercury-containing organisms.[8] Exposure to mercury can occur from breathing contaminated air,[9] from eating foods that have acquired mercury residues during processing,[10] from exposure to mercury vapor in mercury amalgam dental restorations,[11] and from improper use or disposal of mercury and mercury-containing objects, for example, after spills of elemental mercury or improper disposal of fluorescent lamps.[12]

All of these, except elemental liquid mercury, produce toxicity or death with less than a gram. Mercury's zero oxidation state (Hg0) exists as vapor or as liquid metal, its mercurous state (Hg+) exists as inorganic salts, and its mercuric state (Hg2+) may form either inorganic salts or organomercury compounds.[citation needed]

Consumption of whale and dolphin meat, as is the practice in Japan, is a source of high levels of mercury poisoning. Tetsuya Endo, a professor at the Health Sciences University of Hokkaido, has tested whale meat purchased in the whaling town of Taiji and found mercury levels more than 20 times the acceptable Japanese standard.[13]

Human-generated sources, such as coal-burning power plants[14] emit about half of atmospheric mercury, with natural sources such as volcanoes responsible for the remainder. An estimated two-thirds of human-generated mercury comes from stationary combustion, mostly of coal. Other important human-generated sources include gold production, nonferrous metal production, cement production, waste disposal, human crematoria, caustic soda production, pig iron and steel production, mercury production (mostly for batteries), and biomass burning.[15]

Small independent gold-mining operation workers are at higher risk of mercury poisoning because of crude processing methods. Such is the danger for the galamsey in Ghana and similar workers known as orpailleurs in neighboring francophone countries. While no official government estimates of the labor force have been made, observers believe 20,000–50,000 work as galamseys in Ghana, a figure including many women, who work as porters. Similar problems have been reported amongst the gold miners of Indonesia.[16]

Some mercury compounds, especially organomercury compounds, can also be readily absorbed through direct skin contact. Mercury and its compounds are commonly used in chemical laboratories, hospitals, dental clinics, and facilities involved in the production of items such as fluorescent light bulbs, batteries, and explosives.[17]

Many traditional medicines, including Ayurvedic medicine and Traditional Chinese medicine contain mercury and other heavy metals.[18][19]

No scientific data support the claim that mercury compounds in vaccine preservatives cause autism[20] or its symptoms.[21]


Compounds of mercury tend to be much more toxic than either the elemental form or the salts. These compounds have been implicated in causing brain and liver damage. The most dangerous mercury compound, dimethylmercury, is so toxic that even a few microliters spilled on the skin, or even on a latex glove, can cause death.[22][23]

Methylmercury and related organomercury compounds

Methylmercury is the major source of organic mercury for all individuals.[24] Due to bioaccumulation it works its way up through the food web and thus biomagnifies, resulting in high concentrations among populations of some species. Top predatory fish, such as tuna or swordfish, are usually of greater concern than smaller species. The US FDA and the EPA advise women of child-bearing age, nursing mothers, and young children to completely avoid swordfish, shark, king mackerel and tilefish from the Gulf of Mexico, and to limit consumption of albacore ("white") tuna to no more than 170 g (6 oz) per week, and of all other fish and shellfish to no more than 340 g (12 oz) per week.[25] A 2006 review of the risks and benefits of fish consumption found, for adults, the benefits of one to two servings of fish per week outweigh the risks, even (except for a few fish species) for women of childbearing age, and that avoidance of fish consumption could result in significant excess coronary heart disease deaths and suboptimal neural development in children.[26]

The period between exposure to methylmercury and the appearance of symptoms in adult poisoning cases is long. The longest recorded latent period is five months after a single exposure, in the Dartmouth case (see History); other latent periods in the range of weeks to months have also been reported. No explanation for this long latent period is known. When the first symptom appears, typically paresthesia (a tingling or numbness in the skin), it is followed rapidly by more severe effects, sometimes ending in coma and death. The toxic damage appears to be determined by the peak value of mercury, not the length of the exposure.[27]

Methylmercury exposure during rodent gestation, a developmental period that approximately models human neural development during the first two trimesters of gestation,[28][29] has long-lasting behavioral consequences that appear in adulthood and, in some cases, may not appear until aging. Prefrontal cortex or dopamine neurotransmission could be especially sensitive to even subtle gestational methylmercury exposure[30] and suggests that public health assessments of methylmercury based on intellectual performance may underestimate the impact of methylmercury in public health.

Ethylmercury is a breakdown product of the antibacteriological agent ethylmercurithiosalicylate, which has been used as a topical antiseptic and a vaccine preservative (further discussed under Thiomersal below). Its characteristics have not been studied as extensively as those of methylmercury. It is cleared from the blood much more rapidly, with a half-life of seven to ten days, and it is metabolized much more quickly than methylmercury. It is presumed not to have methylmercury's ability to cross the blood–brain barrier via a transporter, but instead relies on simple diffusion to enter the brain.[24] Other exposure sources of organic mercury include phenylmercuric acetate and phenylmercuric nitrate. These compounds were used in indoor latex paints for their antimildew properties, but were removed in 1990 because of cases of toxicity.[24]

Inorganic mercury compounds

Mercury occurs as salts such as mercuric chloride (HgCl2) and mercurous chloride (Hg2Cl2), the latter also known as calomel. Because they are more soluble in water, mercuric salts are usually more acutely toxic than mercurous salts. Their higher solubility lets them be more readily absorbed from the gastrointestinal tract. Mercury salts affect primarily the gastrointestinal tract and the kidneys, and can cause severe kidney damage; however, as they cannot cross the blood–brain barrier easily, these salts inflict little neurological damage without continuous or heavy exposure.[31] Mercuric cyanide (Hg(CN)2) is a particularly toxic mercury compound that has been used in murders, as it contains not only mercury but also cyanide, leading to simultaneous cyanide poisoning.[32] The drug n-acetyl penicillamine has been used to treat mercury poisoning with limited success.[33]

Elemental mercury

Quicksilver (liquid metallic mercury) is poorly absorbed by ingestion and skin contact. Its vapor is the most hazardous form. Animal data indicate less than 0.01% of ingested mercury is absorbed through the intact gastrointestinal tract, though it may not be true for individuals suffering from ileus. Cases of systemic toxicity from accidental swallowing are rare, and attempted suicide via intravenous injection does not appear to result in systemic toxicity,[27] though it still causes damage by physically blocking blood vessels both at the site of injection and the lungs. Though not studied quantitatively, the physical properties of liquid elemental mercury limit its absorption through intact skin and in light of its very low absorption rate from the gastrointestinal tract, skin absorption would not be high.[34] Some mercury vapor is absorbed dermally, but uptake by this route is only about 1% of that by inhalation.[35]

In humans, approximately 80% of inhaled mercury vapor is absorbed via the respiratory tract, where it enters the circulatory system and is distributed throughout the body.[36] Chronic exposure by inhalation, even at low concentrations in the range 0.7–42 μg/m3, has been shown in case–control studies to cause effects such as tremors, impaired cognitive skills, and sleep disturbance in workers.[37][38]

Acute inhalation of high concentrations causes a wide variety of cognitive, personality, sensory, and motor disturbances. The most prominent symptoms include tremors (initially affecting the hands and sometimes spreading to other parts of the body), emotional lability (characterized by irritability, excessive shyness, confidence loss, and nervousness), insomnia, memory loss, neuromuscular changes (weakness, muscle atrophy, muscle twitching), headaches, polyneuropathy (paresthesia, stocking-glove sensory loss, hyperactive tendon reflexes, slowed sensory and motor nerve conduction velocities), and performance deficits in tests of cognitive function.[34]


The toxicity of mercury sources can be expected to depend on its nature, i.e., salts vs. organomercury compounds vs. elemental mercury.

One mechanism of mercury toxicity involves its irreversible inhibition of selenoenzymes, such as thioredoxin reductase (IC50 = 9 nM).[39] Although it has many functions, thioredoxin reductase restores vitamins C and E, as well as a number of other important antioxidant molecules, back into their reduced forms, enabling them to counteract oxidative damage.[40] Since the rate of oxygen consumption is particularly high in brain tissues, production of reactive oxygen species (ROS) is accentuated in these vital cells, making them particularly vulnerable to oxidative damage and especially dependent upon the antioxidant protection provided by selenoenzymes. High mercury exposures deplete the amount of cellular selenium available for the biosynthesis of thioredoxin reductase and other selenoenzymes that prevent and reverse oxidative damage,[41] which, if the depletion is severe and long lasting, results in brain cell dysfunctions that can ultimately cause death.

Mercury in its various forms is particularly harmful to fetuses as an environmental toxin in pregnancy, as well as to infants. Women who have been exposed to mercury in substantial excess of dietary selenium intakes during pregnancy are at risk of giving birth to children with serious birth defects. Mercury exposures in excess of dietary selenium intakes in young children can have severe neurological consequences, preventing nerve sheaths from forming properly.

Exposure to methylmercury causes increased levels of antibodies sent to myelin basic protein (MBP), which is involved in the myelination of neurons, and glial fibrillary acidic protein (GFAP), which is essential to many central nervous system (CNS). This causes an autoimmmune response against MBP and GFAP and results in the degradation of neural myelin and general decline in function of the CNS.[42]


Diagnosis of elemental or inorganic mercury poisoning involves determining the history of exposure, physical findings, and an elevated body burden of mercury. Although whole-blood mercury concentrations are typically less than 6 μg/L, diets rich in fish can result in blood mercury concentrations higher than 200 μg/L; it is not that useful to measure these levels for suspected cases of elemental or inorganic poisoning because of mercury's short half-life in the blood. If the exposure is chronic, urine levels can be obtained; 24-hour collections are more reliable than spot collections. It is difficult or impossible to interpret urine samples of patients undergoing chelation therapy, as the therapy itself increases mercury levels in the samples.[43]

Diagnosis of organic mercury poisoning differs in that whole-blood or hair analysis is more reliable than urinary mercury levels.[43]


Mercury poisoning can be prevented or minimized by eliminating or reducing exposure to mercury and mercury compounds. To that end, many governments and private groups have made efforts to heavily regulate the use of mercury, or to issue advisories about its use. Most countries have signed the Minamata Convention on Mercury.

The export from the European Union of mercury and some mercury compounds has been prohibited since 15 March 2010.[44] The European Union has banned most uses of mercury.[45] Mercury is allowed for fluorescent light bulbs because of pressure from countries such as Germany, the Netherlands and Hungary, which are connected to the main producers of fluorescent light bulbs: General Electric, Philips and Osram.[46]

US environmental limits[47]
Country Regulating agency Regulated activity Medium Type of mercury compound Type of limit Limit
US Occupational Safety and Health Administration occupational exposure air elemental mercury Ceiling (not to exceed) 0.1 mg/m3
US Occupational Safety and Health Administration occupational exposure air organic mercury Ceiling (not to exceed) 0.05 mg/m3
US Food and Drug Administration eating sea food methylmercury Maximum allowable concentration 1 ppm (1 mg/L)
US Environmental Protection Agency drinking water inorganic mercury Maximum contaminant level 2 ppb (0.002 mg/L)

The United States Environmental Protection Agency (EPA) issued recommendations in 2004 regarding exposure to mercury in fish and shellfish.[48] The EPA also developed the "Fish Kids" awareness campaign for children and young adults [49] on account of the greater impact of mercury exposure to that population.

Cleaning spilled mercury

EPA workers clean up residential mercury spill in 2004

Mercury thermometers and mercury light bulbs are not as common as they used to be, and the amount of mercury they contain is unlikely to be a health concern if handled carefully. However, broken items still require careful cleanup, as mercury can be hard to collect and it is easy to accidentally create a much larger exposure problem.[50] If available, powdered sulfur may be applied to the spill, in order to create a solid compound that is more easily removed from surfaces than liquid mercury.[51]


Identifying and removing the source of the mercury is crucial. Decontamination requires removal of clothes, washing skin with soap and water, and flushing the eyes with saline solution as needed.

Chelation therapy

Chelation therapy for acute inorganic mercury poisoning can be done with DMSA, 2,3-dimercapto-1-propanesulfonic acid (DMPS), D-penicillamine (DPCN), or dimercaprol (BAL).[24] Only DMSA is FDA-approved for use in children for treating mercury poisoning. However, several studies found no clear clinical benefit from DMSA treatment for poisoning due to mercury vapor.[52] No chelator for methylmercury or ethylmercury is approved by the FDA; DMSA is the most frequently used for severe methylmercury poisoning, as it is given orally, has fewer side-effects, and has been found to be superior to BAL, DPCN, and DMPS.[24] α-Lipoic acid (ALA) has been shown to be protective against acute mercury poisoning in several mammalian species when it is given soon after exposure; correct dosage is required, as inappropriate dosages increase toxicity. Although it has been hypothesized that frequent low dosages of ALA may have potential as a mercury chelator, studies in rats have been contradictory.[53] Glutathione and N-acetylcysteine (NAC) are recommended by some physicians, but have been shown to increase mercury concentrations in the kidneys and the brain.[53]

Chelation therapy can be hazardous if administered incorrectly. In August 2005, an incorrect form of EDTA (edetate disodium) used for chelation therapy resulted in hypocalcemia, causing cardiac arrest that killed a five-year-old autistic boy.[54]


Experimental findings have demonstrated an interaction between selenium and methylmercury, but epidemiological studies have found little evidence that selenium helps to protect against the adverse effects of methylmercury.[55]


Some of the toxic effects of mercury are partially or wholly reversible, either through specific therapy or through natural elimination of the metal after exposure has been discontinued.[56] Autopsy findings point to a half-life of inorganic mercury in human brains of 27.4 years.[57] Heavy or prolonged exposure can do irreversible damage, in particular in fetuses, infants, and young children. Young's syndrome is believed to be a long-term consequence of early childhood mercury poisoning.[58]

Mercuric chloride may cause cancer as it has caused increases in several types of tumors in rats and mice, while methyl mercury has caused kidney tumors in male rats. The EPA has classified mercuric chloride and methyl mercury as possible human carcinogens (ATSDR, EPA)

Detection in biological fluids

Mercury may be measured in blood or urine to confirm a diagnosis of poisoning in hospitalized people or to assist in the forensic investigation in a case of fatal overdosage. Some analytical techniques are capable of distinguishing organic from inorganic forms of the metal. The concentrations in both fluids tend to reach high levels early after exposure to inorganic forms, while lower but very persistent levels are observed following exposure to elemental or organic mercury. Chelation therapy can cause a transient elevation of urine mercury levels.[59]


  • Several Chinese emperors and other Chinese nobles are known or suspected to have died or been sickened by mercury poisoning after alchemists administered them "elixirs" to promote health, longevity, or immortality that contained either elemental mercury or (more commonly) cinnabar. Among the most prominent examples:
    • The first emperor of unified China, Qin Shi Huang, it is reported, died in 210 BC of ingesting mercury pills that were intended to give him eternal life.[60]
    • Emperor Xuānzong of Tang, one of the emperors of the late Tang dynasty of China, was prescribed "cinnabar that had been treated and subdued by fire" to achieve immortality.[61] Concerns that the prescription was having ill effects on the emperor's health and sanity were waved off by the imperial alchemists, who cited medical texts listing a number of the emperor's conditions (including itching, formication, swelling, and muscle weakness), today recognized as signs and symptoms of mercury poisoning, as evidence that the elixir was effectively treating the emperor's latent ailments.[61] Xuānzong became irritable and paranoid, and he seems to have ultimately died in 859 from the poisoning.[61]
  • During the Spanish conquest of the New World in the 16th and 17th centuries, slave mining of mercury deposits was common because the metal was used to purify the rich silver deposits in South America before being shipped back to Spain. To avoid the effects of mercury poisoning on their children, parents were known to purposefully maim or dismember their children to make them unable to work in the mines.[62]
  • The phrase mad as a hatter is likely a reference to mercury poisoning among milliners (so-called "mad hatter disease"), as mercury-based compounds were once used in the manufacture of felt hats in the 18th and 19th century. (The Mad Hatter character of Alice in Wonderland was, it is presumed, inspired by an eccentric furniture dealer named Theophilus Carter. Carter was not a victim of mad hatter disease although Lewis Carroll would have been familiar with the phenomenon of dementia that occurred among hatters.)[63][64]
  • In 1810, two British ships, HMS Triumph and HMS Phipps, salvaged a large load of elemental mercury from a wrecked Spanish vessel near Cadiz, Spain. The bladders containing the mercury soon ruptured. The element spread about the ships in liquid and vapor forms. The sailors presented with neurologic compromises: tremor, paralysis, and excessive salivation as well as tooth loss, skin problems, and pulmonary complaints. In 1823 William Burnet, MD published a report on the effects of Mercurial vapor.[65] The Triumph’s surgeon, Henry Plowman, had concluded that the ailments had arisen from inhaling the mercurialized atmosphere. His treatment was to order the lower deck gun ports to be opened, when it was safe to do so; sleeping on the orlop was forbidden; and no men slept in the lower deck if they were at all symptomatic. Windsails were set to channel fresh air into the lower decks day and night.[66]
  • Historically, gold amalgam was widely used in gilding, leading to numerous casualties among the workers. It is estimated that during the construction of Saint Isaac's Cathedral alone, 60 men died from the gilding of the main dome.[67][68]
  • For years, including the early part of his presidency, Abraham Lincoln took a common medicine of his time called "blue mass," which contained significant amounts of mercury.
  • On September 5, 1920, silent movie actress Olive Thomas ingested mercury capsules dissolved in an alcoholic solution at the Hotel Ritz in Paris.[69] There is still controversy over whether it was suicide, or whether she consumed the external preparation by mistake. Her husband, Jack Pickford (the brother of Mary Pickford), had syphilis, and the mercury was used as a treatment of the venereal disease at the time. She died a few days later at the American Hospital in Neuilly.[70]
  • An early scientific study of mercury poisoning was in 1923–6 by the German inorganic chemist, Alfred Stock, who himself became poisoned, together with his colleagues, by breathing mercury vapor that was being released by his laboratory equipment—diffusion pumps, float valves, and manometers—all of which contained mercury, and also from mercury that had been accidentally spilt and remained in cracks in the linoleum floor covering. He published a number of papers on mercury poisoning, founded a committee in Berlin to study cases of possible mercury poisoning, and introduced the term micromercurialism.[71]
  • The term Hunter-Russell syndrome derives from a study of mercury poisoning among workers in a seed packing factory in Norwich, England in the late 1930s who breathed methylmercury that was being used as a seed disinfectant and preservative.[72]
  • Outbreaks of methylmercury poisoning occurred in several places in Japan during the 1950s due to industrial discharges of mercury into rivers and coastal waters. The best-known instances were in Minamata and Niigata. In Minamata alone, more than 600 people died due to what became known as Minamata disease. More than 21,000 people filed claims with the Japanese government, of which almost 3000 became certified as having the disease. In 22 documented cases, pregnant women who consumed contaminated fish showed mild or no symptoms but gave birth to infants with severe developmental disabilities.[73]
  • Mercury poisoning of two First Nation communities in Ontario, Canada occurred in the late 1960s due to industrial chemical waste released into the waterways and air.
  • Widespread mercury poisoning occurred in rural Iraq in 1971–1972, when grain treated with a methylmercury-based fungicide that was intended for planting only was used by the rural population to make bread, causing at least 6530 cases of mercury poisoning and at least 459 deaths (see Basra poison grain disaster).[74]
  • On August 14, 1996, Karen Wetterhahn, a chemistry professor working at Dartmouth College, spilled a small amount of dimethylmercury on her latex glove. She began experiencing the symptoms of mercury poisoning five months later and, despite aggressive chelation therapy, died a few months later from brain malfunction due to mercury intoxication.[22][23]
  • In April 2000, Alan Chmurny attempted to kill a former employee, Marta Bradley, by pouring mercury into the ventilation system of her car.[75]
  • On March 19, 2008, Tony Winnett, 55, inhaled mercury vapors while trying to extract gold from computer parts (by using liquid mercury to separate gold from the rest of the alloy), and died ten days later. His Oklahoma residence became so contaminated that it had to be gutted.[76][77]
  • In December 2008, actor Jeremy Piven was diagnosed with mercury poisoning possibly resulting from eating sushi twice a day for twenty years or from taking herbal remedies.[78]
  • In India, a study by Centre for Science and Environment and Indian Institute of Toxicology Research has found that in the country's energy capital Singrauli, mercury is slowly entering people's homes, food, water and even blood.[79]

Infantile acrodynia

Infantile acrodynia (also known as "calomel disease", "erythredemic polyneuropathy", and "pink disease") is a type of mercury poisoning in children characterized by pain and pink discoloration of the hands and feet.[80] The word is derived from the Greek, where άκρο means end or extremity, and οδυνη means pain. Acrodynia resulted primarily from calomel in teething powders and decreased greatly after calomel was excluded from most teething powders in 1954.[81][82]

Acrodynia is difficult to diagnose, "it is most often postulated that the etiology of this syndrome is an idiosyncratic hypersensitivity reaction to mercury because of the lack of correlation with mercury levels, many of the symptoms resemble recognized mercury poisoning."[83]


Mercury was once prescribed as a purgative.[citation needed] Many mercury-containing compounds were once used in medicines. These include calomel (mercurous chloride), and mercuric chloride.


In 1999, the Centers for Disease Control (CDC) and the American Academy of Pediatrics (AAP) asked vaccine makers to remove the organomercury compound thiomersal (spelled "thimerosal" in the US) from vaccines as quickly as possible, and thiomersal has been phased out of US and European vaccines, except for some preparations of influenza vaccine.[84] The CDC and the AAP followed the precautionary principle, which assumes that there is no harm in exercising caution even if it later turns out to be unwarranted, but their 1999 action sparked confusion and controversy that Thiomersal was the cause of autism.[84]

Since 2000, the thiomersal in child vaccines has been alleged to contribute to autism, and thousands of parents in the United States have pursued legal compensation from a federal fund.[85] A 2004 Institute of Medicine (IOM) committee favored rejecting any causal relationship between thiomersal-containing vaccines and autism.[86] Autism incidence rates increased steadily even after thiomersal was removed from childhood vaccines.[87] Currently there is no accepted scientific evidence that exposure to thiomersal is a factor in causing autism.[88]

Dental amalgam toxicity

Dental amalgam is a possible cause of low-level mercury poisoning due to its use in dental fillings. Discussion on the topic includes debates on whether amalgam should be used, with critics arguing that its toxic effects make it unsafe.


Some skin whitening products contain the toxic mercury(II) chloride as the active ingredient. When applied, the chemical readily absorbs through the skin into the bloodstream.[89] The use of mercury in cosmetics is illegal in the United States. However, cosmetics containing mercury are often illegally imported. Following a certified case of mercury poisoning resulting from the use of an imported skin whitening product, the United States Food and Drug Administration warned against the use of such products.[90][91] Symptoms of mercury poisoning have resulted from the use of various mercury-containing cosmetic products.[27][92][93] The use of skin whitening products is especially popular amongst Asian women.[94] In Hong Kong in 2002, two products were discovered to contain between 9,000 and 60,000 times the recommended dose.[95]

Fluorescent lamps

Fluorescent lamps contain mercury, which is released when bulbs break. Mercury in bulbs is typically present as either elemental mercury liquid, vapor, or both, since the liquid evaporates at ambient temperature.[96] When broken indoors, bulbs may emit sufficient mercury vapor to present health concerns, and the U.S. Environmental Protection Agency recommends evacuating and airing out a room for at least 15 minutes after breaking a fluorescent light bulb.[97] Breakage of multiple bulbs presents a greater concern. A 1987 report described a 23-month-old toddler who suffered anorexia, weight loss, irritability, profuse sweating, and peeling and redness of fingers and toes. This case of acrodynia was traced to exposure of mercury from a carton of 8-foot fluorescent light bulbs that had broken in a potting shed adjacent to the main nursery. The glass was cleaned up and discarded, but the child often used the area to play in .[98]

Assassination attempts

Mercury has, allegedly, been used at various times to assassinate people. In 2008, Russian lawyer Karinna Moskalenko claimed to have been poisoned by mercury left in her car,[99] while in 2010 journalists Viktor Kalashnikov and Marina Kalashnikova accused Russia's FSB of trying to poison them.[100]

See also


  1. 1.0 1.1 1.2 "Mercury". NIEHS. Archived from the original on 19 November 2016. Retrieved 19 November 2016.
  2. 2.0 2.1 2.2 2.3 2.4 Bose-O'Reilly, S; McCarty, KM; Steckling, N; Lettmeier, B (September 2010). "Mercury exposure and children's health". Current Problems in Pediatric and Adolescent Health Care. 40 (8): 186–215. doi:10.1016/j.cppeds.2010.07.002. PMC 3096006. PMID 20816346.
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Bernhoft, RA (2012). "Mercury toxicity and treatment: a review of the literature". Journal of Environmental and Public Health. 2012: 460508. doi:10.1155/2012/460508. PMC 3253456. PMID 22235210.
  4. 4.0 4.1 4.2 4.3 4.4 "Mercury and health". WHO. January 2016. Archived from the original on 20 November 2016. Retrieved 19 November 2016.
  5. 5.0 5.1 5.2 Kosnett, MJ (December 2013). "The role of chelation in the treatment of arsenic and mercury poisoning". Journal of Medical Toxicology. 9 (4): 347–54. doi:10.1007/s13181-013-0344-5. PMC 3846971. PMID 24178900.
  6. Hong, YS; Kim, YM; Lee, KE (November 2012). "Methylmercury exposure and health effects". Journal of Preventive Medicine and Public Health = Yebang Uihakhoe Chi. 45 (6): 353–63. doi:10.3961/jpmph.2012.45.6.353. PMC 3514465. PMID 23230465.
  7. Horowitz Y, Greenberg D, Ling G, Lifshitz M (2002). "Acrodynia: a case report of two siblings". Arch. Dis. Child. 86 (6): 453. doi:10.1136/adc.86.6.453. PMC 1762992. PMID 12023189.
  8. United States Environmental Protection Agency (December 1997). Mercury Study Report to Congress (PDF). Vol. 3. Washington, D.C.: United States Environmental Protection Agency. Archived (PDF) from the original on 2011-02-03.
  9. ATSDR Mercury ToxFAQ (April 1999). "ToxFAQs: Mercury". Agency for Toxic Substances and Disease Registry. Archived from the original on 2007-07-11. Retrieved 2007-07-25.
  10. Dufault R, LeBlanc B, Schnoll R, et al. (2009). "Mercury from chlor-alkali plants: measured concentrations in food product sugar". Environ. Health. 8 (1): 2. doi:10.1186/1476-069X-8-2. PMC 2637263. PMID 19171026.
  11. Levy M. (1995). "Dental Amalgam: toxicological evaluation and health risk assessment". J. Can. Dent. Assoc. 61: 667–8, 671–4.
  12. Goldman LR, Shannon MW (2001). "Technical report: mercury in the environment: implications for pediatricians". Pediatrics. 108 (1): 197–205. doi:10.1542/peds.108.1.197. PMID 11433078.
  13. Mercury danger in dolphin meat. 2009 Archived 2012-06-30 at
  14. "Mercury". 2013-07-08. Archived from the original on 2015-04-08. Retrieved 2015-04-08.
  15. Pacyna EG, Pacyna JM, Steenhuisen F, Wilson S (2006). "Global anthropogenic mercury emission inventory for 2000". Atmos. Environ. 40 (22): 4048–63. Bibcode:2006AtmEn..40.4048P. doi:10.1016/j.atmosenv.2006.03.041.
  16. How mercury poisons gold miners and enters the food chain BBC News - How mercury poisons gold miners and enters the food chain at the Wayback Machine (archived 2013-09-23), BBC News
  17. United States Environmental Protection Agency (December 1997). Mercury Study Report to Congress (PDF). Vol. 4. Washington, D.C.: United States Environmental Protection Agency. Archived (PDF) from the original on 2011-02-03.
  18. Lynch, E; Braithwaite, R (July 2005). "A review of the clinical and toxicological aspects of 'traditional' (herbal) medicines adulterated with heavy metals". Expert Opinion on Drug Safety. 4 (4): 769–78. doi:10.1517/14740338.4.4.769. PMID 16011453.
  19. Ching, Felix M. (2007). Chinese Herbal Drug Research Trends. Nova Publishers. ISBN 9781600219283. Archived from the original on 2017-12-18. Retrieved 2017-10-15.
  20. Doja A, Roberts W (2006). "Immunizations and autism: a review of the literature". Can J Neurol Sci. 33 (4): 341–6. doi:10.1017/s031716710000528x. PMID 17168158.
  21. Thompson WW, Price C, Goodson B, et al. (2007). "Early thimerosal exposure and neuropsychological outcomes at 7 to 10 years". N. Engl. J. Med. 357 (13): 1281–92. doi:10.1056/NEJMoa071434. PMID 17898097. Archived from the original on 2021-08-28. Retrieved 2020-01-22.
  22. 22.0 22.1 The Karen Wetterhahn story DimethylMercury - MOTM at the Wayback Machine (archived 2012-05-30) – University of Bristol web page documenting her death, retrieved December 9, 2006.
  23. 23.0 23.1 OSHA update following Karen Wetterhahn's death Safety and Health Information Bulletins at the Wayback Machine (archived 2015-07-11)(Positional parameters ignored)
  24. 24.0 24.1 24.2 24.3 24.4 Clifton JC 2nd (2007). "Mercury exposure and public health". Pediatr. Clin. North Am. 54 (2): 237–69, viii. doi:10.1016/j.pcl.2007.02.005. PMID 17448359.
  25. What you need to know about mercury in fish and shellfish – Advice for women who might become pregnant women who are pregnant nursing mothers young children. Document Display at the Wayback Machine (archived 2013-05-17)(Positional parameters ignored) U.S. FDA and U.S. EPA Advisory EPA-823-F-04-009, March 2004.
  26. Mozaffarian D, Rimm EB (2006). "Fish intake, contaminants, and human health: evaluating the risks and the benefits". JAMA. 296 (15): 1885–99. doi:10.1001/jama.296.15.1885. PMID 17047219.
  27. 27.0 27.1 27.2 Clarkson TW, Magos L (2006). "The toxicology of mercury and its chemical compounds". Crit. Rev. Toxicol. 36 (8): 609–62. doi:10.1080/10408440600845619. PMID 16973445.
  28. Bayer, SA; Altman, J; Russo, RJ; Xhang, X (1993). "Timetables of neurogenesis in the human brain based on experimentally determined patterns in the rat". Neurotoxicology. 14 (1): 83–144. PMID 8361683.
  29. Rice, DC; Barone, S (2000). "Critical periods of vulnerability for the developing nervous system: evidence from human and animal models". Environmental Health Perspectives. 108 (3): 511–533. doi:10.2307/3454543. JSTOR 3454543. PMC 1637807. PMID 10852851.
  30. Newland, MC; Reed, MN; Rasmussen, E (2015). "A hypothesis about how early developmental methylmercury exposure disrupts behavior in adulthood". Behavioural Processes. 114: 41–51. doi:10.1016/j.beproc.2015.03.007. PMC 4407818. PMID 25795099.
  31. Langford NJ, Ferner RE (1999). "Toxicity of mercury". Journal of Human Hypertension. 13 (10): 651–6. doi:10.1038/sj.jhh.1000896. PMID 10516733.
  32. Emsley, John. The Elements of Murder. Oxford: Oxford University Press, 2005. ISBN 0-19-280599-1
  33. "Mercuric Cyanide." 1987. "Mercuric Cyanide". Archived from the original on 2011-05-11. Retrieved 2011-02-22. (accessed April 2, 2009).
  34. 34.0 34.1 ATSDR. 1999. Toxicological Profile for Mercury. Atlanta, GA:Agency for Toxic Substances and Disease Registry. "Archived copy" (PDF). Archived (PDF) from the original on 2011-07-21. Retrieved 2011-02-22.{{cite web}}: CS1 maint: archived copy as title (link)
  35. Hursh JB, Clarkson TW, Miles E, Goldsmith LA (1989). "Percutaneous absorption of mercury vapor by man". Arch. Environ. Health. 44 (2): 120–127. doi:10.1080/00039896.1989.9934385. PMID 2494955.
  36. Cherian MG, Hursh JG, Clarkson TW (1978). "Radioactive mercury distribution in biological fluids and excretion in human subjects after inhalation of mercury vapor". Archives of Environmental Health. 33 (3): 190–214. doi:10.1080/00039896.1978.10667318. PMID 686833.
  37. Ngim CH, Foo SC, Boey KW, Keyaratnam J (1992). "Chronic neurobehavioral effects of elemental mercury in dentists". British Journal of Industrial Medicine. 49 (11): 782–790. doi:10.1136/oem.49.11.782. PMC 1039326. PMID 1463679.
  38. Liang YX, Sun RK, Chen ZQ, Li LH (1993). "Psychological effects of low exposure to mercury vapor: Application of computer-administered neurobehavioral evaluation system". Environmental Research. 60 (2): 320–327. Bibcode:1993ER.....60..320L. doi:10.1006/enrs.1993.1040. PMID 8472661.
  39. Carvalho CM, Chew EH, Hashemy SI, Lu J, Holmgren A (2008). "Inhibition of the human thioredoxin system: A molecular mechanism of mercury toxicity". Journal of Biological Chemistry. 283 (18): 11913–11923. doi:10.1074/jbc.m710133200. PMID 18321861.
  40. Linster, C.L.; Van Schaftingen, E. (2007). "Vitamin C: Biosynthesis, recycling and degradation in mammals". FEBS Journal. 274 (1): 1–22. doi:10.1111/j.1742-4658.2006.05607.x. PMID 17222174.
  41. Ralston, Nicholas V.C.; Raymond, Laura J. (2010). "Dietary selenium's protective effects against methylmercury toxicity". Toxicology. 278 (1): 112–123. doi:10.1016/j.tox.2010.06.004. PMID 20561558.
  42. el-Fawal, HA; Gong, Z; Little, AR; Evans, HL (1996). "Exposure to methyl mercury results in serum autoantibodies to neurotypic and gliotypic proteins". Neurotoxicology. 17 (1): 267–76. ISSN 0161-813X. PMID 8784838.
  43. 43.0 43.1 Ibrahim D, Froberg B, Wolf A, Rusyniak DE (2006). "Heavy metal poisoning: clinical presentations and pathophysiology". Clin. Lab. Med. 26 (1): 67–97, viii. doi:10.1016/j.cll.2006.02.003. PMID 16567226.
  44. "Export-ban of mercury and mercury compounds from the EU by 2011" (Press release). European Parliament. 2008-05-21. Archived from the original on 2008-09-25. Retrieved 2008-06-10.
  45. "Archive copy". Archived from the original on 2019-10-17. Retrieved 2020-02-09.{{cite web}}: CS1 maint: archived copy as title (link)
  46. "Archive copy". Archived from the original on 2020-02-09. Retrieved 2020-02-09.{{cite web}}: CS1 maint: archived copy as title (link)
  47. ATSDR – Mercury – Regulations and Advisories Wayback Machine at the Wayback Machine (archived 2011-06-06)
  48. FDA/EPA 2004 Advice on What You Need to Know About Mercury in Fish and Shellfish What You Need to Know about Mercury in Fish and Shellfish at the Wayback Machine (archived 2009-03-08)(Positional parameters ignored)
  49. EPA Fish Kids Flash-based movie Fish Kids at the Wayback Machine (archived 2008-10-11)(Positional parameters ignored)
  50. Cleaning Up Spilled Mercury Can a broken thermometer or light bulb cause mercury poisoning? - Health questions - NHS Choices at the Wayback Machine (archived 2016-04-03)
  51. EPA, OA, US (2015-08-18). "What to Do if a Mercury Thermometer Breaks | US EPA". US EPA. Archived from the original on 2018-03-23. Retrieved 2018-03-22.
  52. Risher JF, Amler SN (2005). "Mercury exposure: evaluation and intervention the inappropriate use of chelating agents in the diagnosis and treatment of putative mercury poisoning". Neurotoxicology. 26 (4): 691–9. doi:10.1016/j.neuro.2005.05.004. PMID 16009427. Archived from the original on 2019-08-30. Retrieved 2018-09-18.
  53. 53.0 53.1 Rooney JP (2007). "The role of thiols, dithiols, nutritional factors and interacting ligands in the toxicology of mercury". Toxicology. 234 (3): 145–56. doi:10.1016/j.tox.2007.02.016. PMID 17408840.
  54. Hazards of chelation therapy:
  55. Watanabe C (2002). "Modification of mercury toxicity by selenium: practical importance?" (PDF). Tohoku J. Exp. Med. 196 (2): 71–7. doi:10.1620/tjem.196.71. PMID 12498318. Archived from the original on 2009-01-13.
  56. pink disease – collected articles (63pp). May 2000 Wayback Machine at the Wayback Machine (archived 2009-03-26)
  57. Rooney, J.P.K. (2014). "The retention time of inorganic mercury in the brain — A systematic review of the evidence". Toxicology and Applied Pharmacology. 274 (3): 425–435. doi:10.1016/j.taap.2013.12.011. hdl:2262/68176. PMID 24368178.
  58. Hendry WF, A'Hern RP, Cole PJ (1993). "Was Young's syndrome caused by exposure to mercury in childhood?". BMJ. 307 (6919): 1579–82. doi:10.1136/bmj.307.6919.1579. PMC 1697782. PMID 8292944.
  59. R. Baselt, Disposition of Toxic Drugs and Chemicals in Man, 8th edition, Biomedical Publications, Foster City, CA, 2008, pp. 923–927.
  60. Zhao HL, Zhu X, Sui Y (2006). "The short-lived Chinese emperors". J. Am. Geriatr. Soc. 54 (8): 1295–6. doi:10.1111/j.1532-5415.2006.00821.x. PMID 16914004.
  61. 61.0 61.1 61.2 Chris Stewart (22 January 2017). "#116-Tang 28: I, Xuānzong". The History of China (Podcast). Agora Podcast Network. Event occurs at 29:30. Archived from the original on 6 March 2017. Retrieved 24 January 2017.
  62. Green, John. "The Spanish Empire, Silver, & Runaway Inflation". Crash Course World History. Archived from the original on 24 February 2017. Retrieved 24 February 2017.
  63. Waldron HA (1983). "Did the Mad Hatter have mercury poisoning?". Br. Med. J. 287 (6409): 1961. doi:10.1136/bmj.287.6409.1961. PMC 1550196. PMID 6418283.
  64. Kathryn J. Kitzmiller, Ph.D. The Not-So-Mad Hatter: Occupational Hazards of Mercury The Not-So-Mad Hatter: Occupational Hazards of Mercury at the Wayback Machine (archived 2013-12-02)
  65. An Account of the Effect of Mercurial Vapors on the Crew of His Majesty's Ship Triumph, in the year 1810. By Wm. Burnet, M.D. one of the Medical Commissioners of the Navy, formerly Physician and Inspector of Hospitals to the Mediterranean Fleet.
  66. Michael J. Doherty MD: The Quicksilver Prize: Mercury vapor poisoning aboard HMS Triumph and HMS Phipps (2003).
  67. "An article about the cathedral". Archived from the original on 2011-08-28.
  68. "An article about gilding". Archived from the original on 2013-10-23.
  69. "Bichloride of Mercury Killed Olive Thomas". The Toronto World. September 15, 1920. p. 6. Archived from the original on December 12, 2019. Retrieved August 27, 2018.
  70. Foster, Charles (2000). Stardust and Shadows: Canadians in Early Hollywood, page 257. Toronto, Canada: Dundurn Press, 2000. ISBN 978-1550023480.
  71. Stock A (1926). "Die Gefaehrlichkeit des Quecksilberdampfes". Zeitschrift für Angewandte Chemie. 39 (15): 461–466. doi:10.1002/ange.19260391502.
  72. Hunter D, Bomford RR, Russell DS (1940). "Poisoning by methylmercury compounds". Quart. J. Med. 9: 193–213.
  73. Davidson PW, Myers GJ, Weiss B (2004). "Mercury exposure and child development outcomes". Pediatrics. 113 (4 Suppl): 1023–9. doi:10.1542/peds.113.4.S1.1023 (inactive 2020-01-22). PMID 15060195. Archived from the original on 2012-12-16.{{cite journal}}: CS1 maint: DOI inactive as of January 2020 (link)
  74. Engler R (April 27, 1985). "Technology out of Control". The Nation. 240. Archived from the original on March 17, 2011.
  75. Vargas JA (2007-01-26). "'Mad Scientist': On Court TV, Fatal Chemistry". The Washington Post. Archived from the original on 2012-11-08. Retrieved 2007-01-28.
  76. Swearengin M (2008-04-01). "Man dies from mercury poisoning after trying to extract gold". Durant Daily Democrat.
  77. (Associated Press) (2008-04-01). "Colbert man dies from mercury poisoning". Tulsa World. Archived from the original on 2019-05-18. Retrieved 2019-05-18.
  78. Tiffany McGee (2009-01-15). "Jeremy Piven Explains His Mystery Ailment". People. Archived from the original on 2009-01-21. Retrieved 2009-01-15.
  79. "Archived copy". Archived from the original on 2017-10-15. Retrieved 2017-10-15.{{cite web}}: CS1 maint: archived copy as title (link)
  80. James WD, Berger TG, Elston DM (2006). Andrews' diseases of the skin: clinical dermatology (10th ed.). Saunders. p. 134. ISBN 978-0-7216-2921-6.
  81. Bjørklund G (1995). "Mercury and Acrodynia" (PDF). Journal of Orthomolecular Medicine. 10 (3 & 4): 145–146. Archived (PDF) from the original on 2011-07-21.
  82. Dally A (1997). "The rise and fall of pink disease". Soc. Hist. Med. 10 (2): 291–304. doi:10.1093/shm/10.2.291. PMID 11619497.
  83. Ford M, Delaney KA, Ling L, Erickson T (2000). Clinical Toxicology (1st ed.). Saunders. ISBN 978-0-7216-5485-0.
  84. 84.0 84.1 Offit PA (2007). "Thimerosal and vaccines—a cautionary tale". N. Engl. J. Med. 357 (13): 1278–9. doi:10.1056/NEJMp078187. PMID 17898096.
  85. Sugarman SD (2007). "Cases in vaccine court—legal battles over vaccines and autism". N. Engl. J. Med. 357 (13): 1275–7. doi:10.1056/NEJMp078168. PMID 17898095. Archived from the original on 2019-06-27. Retrieved 2019-08-16.
  86. Immunization Safety Review Committee (2004). Immunization Safety Review: Vaccines and Autism. The National Academies Press. doi:10.17226/10997. ISBN 978-0-309-09237-1. PMID 20669467. Archived from the original on 2012-07-04.
  87. Gerber, Jeffrey S.; Paul A. Offit (2009). "Vaccines and Autism: A Tale of Shifting Hypotheses". Clinical Infectious Diseases. 48 (4): 456–461. doi:10.1086/596476. PMC 2908388. PMID 19128068.
  88. Doja A, Roberts W (2006). "Immunizations and autism: a review of the literature". Can. J. Neurol. Sci. 33 (4): 341–6. doi:10.1017/s031716710000528x. PMID 17168158.
  89. Counter SA (December 16, 2003). Whitening skin can be deadly. The Boston Globe. Archived from the original on September 1, 2009.
  90. "FDA Proposes Hydroquinone Ban". Archived from the original on 2007-07-03.FDA bans hydroquinone in skin whitening products
  91. "NYC Health Dept. Warns Against Use of "Skin-lightening" Creams Containing Mercury or Similar Products Which Do Not List Ingredients". January 27, 2005. Archived from the original on May 24, 2007.
  92. Counter SA, Buchanan LH. "Mercury exposure in children: a review" (PDF). Archived from the original (PDF) on 2007-06-30. {{cite journal}}: Cite journal requires |journal= (help)
  93. Mahaffey KR (2005). "Exposure to Mercury in the Americas". Dynamics of Mercury Pollution on Regional and Global Scales. Springer. pp. 345–384. doi:10.1007/0-387-24494-8_15. ISBN 978-0-387-24493-8.
  94. In a survey, 28% of Koreans and 50% of Philippians say that they use skin whitening products."Skin lightening in Asia? A bright future?". Archived from the original on 2007-05-25.
  95. Bray M (2002-05-15). SKIN DEEP: Dying to be white. CNN. Archived from the original on 2010-04-08. Retrieved 2010-05-12.
  96. Aucott M, McLinden M, Winka M (2003). "Release of mercury from broken fluorescent bulbs". J. Air Waste Manag. Assoc. 53 (2): 143–51. doi:10.1080/10473289.2003.10466132. PMID 12617289. Archived from the original on 2021-08-28. Retrieved 2019-03-16.
  97. "Spills, disposal and site cleanup". U.S. Environmental Protection Agency. 2009-07-13. Archived from the original on 2009-07-01. Retrieved 2009-06-30.
  98. Tunnessen WW Jr; McMahon KJ; Baser M (1987). "Acrodynia: exposure to mercury from fluorescent light bulbs". Pediatrics. 79 (5): 786–9. PMID 3575038.
  99. Russian lawyer suspects mercury poisoning Russian lawyer suspects mercury poisoning - at the Wayback Machine (archived 2011-12-17), USA
  100. German inquiry into 'poisoning' of Russian dissidents German inquiry into 'poisoning' of Russian dissidents - Telegraph at the Wayback Machine (archived 2010-12-29), Telegraph

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