The chemical compound trichloroethylene is a halocarbon with the formula C2HCl3, commonly used as an industrial solvent. It is a clear, colourless non-flammable liquid with a chloroform-like[1] sweet smell. It should not be confused with the similar 1,1,1-trichloroethane, which is commonly known as chlorothene.

Preferred IUPAC name
Other names
1,1-Dichloro-2-Chloroethylene; 1-Chloro-2,2-Dichloroethylene; Acetylene Trichloride; TCE; Trethylene; Triclene; Trico; Tri; Trimar; Trilene; HCC-1120
3D model (JSmol)
Abbreviations TCE
ECHA InfoCard 100.001.062
EC Number
  • 201-167-4
RTECS number
  • KX4550000
  • InChI=1S/C2HCl3/c3-1-2(4)5/h1H Y
  • InChI=1/C2HCl3/c3-1-2(4)5/h1H
  • Cl\C=C(/Cl)Cl
  • Cl\C=C(/Cl)Cl
  • ClC=C(Cl)Cl
Molar mass 131.38 g/mol
Appearance Colorless liquid
Odor Chloroform-like[1]
Density 1.46 g/cm3 at 20 °C
Melting point −84.8 °C (−120.6 °F; 188.3 K)[2]
Boiling point 87.2 °C (189.0 °F; 360.3 K)[3]
1.280 g/L[4]
Solubility Ether, ethanol, chloroform
log P 2.26[5]
Vapor pressure 58 mmHg (0.076 atm) at 20 °C[1]
−65.8·10−6 cm3/mol
1.4777 at 19.8 °C
Viscosity 0.532 mPa·s[6]
N01AB05 (WHO)
Occupational safety and health (OHS/OSH):
Main hazards
Harmful if swallowed or inhaled, carcinogenic
NFPA 704 (fire diamond)
420 °C (788 °F; 693 K)
Explosive limits 8-10.5%[1]
Lethal dose or concentration (LD, LC):
8450 ppm (mouse, 4 hr)
26300 (rat, 1 hr)[7]
2900 ppm (human)
37,200 ppm (guinea pig, 40 min)
5952 ppm (cat, 2 hr)
8000 ppm (rat, 4 hr)
11,000 (rabbit)[7]
NIOSH (US health exposure limits):
PEL (Permissible)
TWA 100 ppm C 200 ppm 300 ppm (5-minute maximum peak in any 2 hours)[1]
REL (Recommended)
IDLH (Immediate danger)
Ca [1000 ppm][1]
Safety data sheet (SDS) Mallinckrodt Baker
Related compounds
Related vinyl halides
Vinyl chloride
Related compounds
Supplementary data page
Trichloroethylene (data page)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

The IUPAC name is trichloroethene. Industrial abbreviations include TCE, trichlor, Trike, Tricky and tri. It has been sold under a variety of trade names. Under the trade names Trimar and Trilene, trichloroethylene was used as a volatile anesthetic and as an inhaled obstetrical analgesic in millions of patients.

Groundwater and drinking water contamination from industrial discharge including trichloroethylene is a major concern for human health and has precipitated numerous incidents and lawsuits.


Pioneered by Imperial Chemical Industries in Britain, its development was hailed as an anesthetic revolution. Originally thought to possess less hepatotoxicity than chloroform, and without the unpleasant pungency and flammability of ether, TCE use was nonetheless soon found to have several pitfalls. These included promotion of cardiac arrhythmias, low volatility and high solubility preventing quick anesthetic induction, reactions with soda lime used in carbon dioxide absorbing systems, prolonged neurologic dysfunction when used with soda lime, and evidence of hepatotoxicity as had been found with chloroform.

The introduction of halothane in 1956 greatly diminished the use of TCE as a general anesthetic. TCE was still used as an inhalation analgesic in childbirth given by self-administration. Fetal toxicity and concerns for carcinogenic potential of TCE led to its abandonment in developed countries by the 1980s.

The use of trichloroethylene in the food and pharmaceutical industries has been banned in much of the world since the 1970s due to concerns about its toxicity. Legislation has forced the replacement of trichloroethylene in many processes in Europe as the chemical was classified as a carcinogen carrying an R45 risk phrase, May cause cancer. Many degreasing chemical alternatives are being promoted such as Ensolv and Leksol; however, each of these is based on n-propyl bromide which carries an R60 risk phrase of May impair fertility, and they would not be a legally acceptable substitute.

Groundwater contamination by TCE has become an important environmental concern for human exposure.

In 2005 it was announced by the United States Environmental Protection Agency that the agency had completed its Final Health Assessment for Trichloroethylene and released a list of new TCE toxicity values.[8] The results of the study have formally characterized the chemical as a human carcinogen and a non-carcinogenic health hazard. A 2011 toxicological review performed by the EPA continues to list trichloroethylene as a known carcinogen.[9]


Prior to the early 1970s, most trichloroethylene was produced in a two-step process from acetylene. First, acetylene was treated with chlorine using a ferric chloride catalyst at 90 °C to produce 1,1,2,2-tetrachloroethane according to the chemical equation

HC≡CH + 2 Cl2Cl2CHCHCl2

The 1,1,2,2-tetrachloroethane is then dehydrochlorinated to give trichloroethylene. This can be accomplished either with an aqueous solution of calcium hydroxide

2 Cl2CHCHCl2 + Ca(OH)2 → 2 ClCH=CCl2 + CaCl2 + 2 H2O

or in the vapor phase by heating it to 300–500 °C on a barium chloride or calcium chloride catalyst

Cl2CHCHCl2 → ClCH=CCl2 + HCl

Today, however, most trichloroethylene is produced from ethylene. First, ethylene is chlorinated over a ferric chloride catalyst to produce 1,2-dichloroethane.

CH2=CH2 + Cl2ClCH2CH2Cl

When heated to around 400 °C with additional chlorine, 1,2-dichloroethane is converted to trichloroethylene

ClCH2CH2Cl + 2 Cl2 → ClCH=CCl2 + 3 HCl

This reaction can be catalyzed by a variety of substances. The most commonly used catalyst is a mixture of potassium chloride and aluminum chloride. However, various forms of porous carbon can also be used. This reaction produces tetrachloroethylene as a byproduct, and depending on the amount of chlorine fed to the reaction, tetrachloroethylene can even be the major product. Typically, trichloroethylene and tetrachloroethylene are collected together and then separated by distillation.


Trichloroethylene is an effective solvent for a variety of organic materials.

When it was first widely produced in the 1920s, trichloroethylene's major use was to extract vegetable oils from plant materials such as soy, coconut, and palm. Other uses in the food industry included coffee decaffeination and the preparation of flavoring extracts from hops and spices. It has also been used for removing residual water in the production of 100% ethanol.

From the 1930s through the 1970s, both in Europe and in North America, trichloroethylene was used as a volatile anesthetic almost invariably administered with nitrous oxide. Marketed in the UK by ICI under the trade name Trilene it was coloured blue (with a dye called waxoline blue) to avoid confusion with the similar smelling chloroform. TCE replaced earlier anesthetics chloroform and ether in the 1940s, but was itself replaced in the 1960s in developed countries with the introduction of halothane, which allowed much faster induction and recovery times and was considerably easier to administer. Trilene was also used as a potent inhaled analgesic, mainly during childbirth. It was used with halothane in the Tri-service field anaesthetic apparatus used by the UK armed forces under field conditions. As of 2000, however, TCE was still in use as an anesthetic in Africa.[10]

It has also been used as a dry cleaning solvent, although replaced in the 1950s by tetrachloroethylene (also known as perchloroethylene), except for spot cleaning where it is still used under the trade name Picrin.

Trichloroethylene was marketed as 'Ecco 1500 Anti-Static Film Cleaner and Conditioner' until 2009, for use in automatic movie film cleaning machines, and for manual cleaning with lint-free wipes.

Perhaps the greatest use of TCE has been as a degreaser for metal parts. The demand for TCE as a degreaser began to decline in the 1950s in favor of the less toxic 1,1,1-trichloroethane. However, 1,1,1-trichloroethane production has been phased out in most of the world under the terms of the Montreal Protocol, and as a result trichloroethylene has experienced some resurgence in use as a degreaser.

TCE has also been used in the United States to clean kerosene-fueled rocket engines (TCE was not used to clean hydrogen-fueled engines such as the Space Shuttle Main Engine). During static firing, the RP-1 fuel would leave hydrocarbon deposits and vapors in the engine. These deposits had to be flushed from the engine to avoid the possibility of explosion during engine handling and future firing. TCE was used to flush the engine's fuel system immediately before and after each test firing. The flushing procedure involved pumping TCE through the engine's fuel system and letting the solvent overflow for a period ranging from several seconds to 30–35 minutes, depending upon the engine. For some engines, the engine's gas generator and liquid oxygen (LOX) dome were also flushed with TCE prior to test firing.[11][12] The F-1 rocket engine had its LOX dome, gas generator, and thrust chamber fuel jacket flushed with TCE during launch preparations.[12]

TCE is also used in the manufacture of a range of fluorocarbon refrigerants[13] such as 1,1,1,2-tetrafluoroethane more commonly known as HFC 134a. TCE was also used in industrial refrigeration applications due to its high heat transfer capabilities and its low temperature specification. Many industrial refrigeration applications used TCE up to the 1990s in applications such as car testing facilities.

Chemical instability

Despite its widespread use as a metal degreaser, trichloroethylene itself is unstable in the presence of metal over prolonged exposure. As early as 1961 this phenomenon was recognized by the manufacturing industry, when stabilizing additives were added to the commercial formulation. Since the reactive instability is accentuated by higher temperatures, the search for stabilizing additives was conducted by heating trichloroethylene to its boiling point in a reflux condenser and observing decomposition. Definitive documentation of 1,4-dioxane as a stabilizing agent for TCE is scant due to the lack of specificity in early patent literature describing TCE formulations.[14][15] Other chemical stabilizers include ketones such as methyl ethyl ketone.

Physiological effects

When inhaled, trichloroethylene produces central nervous system depression resulting in general anesthesia. These effects may be mediated by trichloroethylene acting as a positive allosteric modulator of inhibitory GABAA and glycine receptors.[16][17] Its high blood solubility results in a less desirable slower induction of anesthesia. At low concentrations it is relatively non-irritating to the respiratory tract. Higher concentrations result in tachypnea. Many types of cardiac arrhythmias can occur and are exacerbated by epinephrine (adrenaline). It was noted in the 1940s that TCE reacted with carbon dioxide (CO2) absorbing systems (soda lime) to produce dichloroacetylene and phosgene.[18] Cranial nerve dysfunction (especially the fifth cranial nerve) was common when TCE anesthesia was given using CO2 absorbing systems. These nerve deficits could last for months. Occasionally facial numbness was permanent. Muscle relaxation with TCE anesthesia sufficient for surgery was poor. For these reasons as well as problems with hepatotoxicity, TCE lost popularity in North America and Europe to more potent anesthetics such as halothane by the 1960s.[19]

The symptoms of acute non-medical exposure are similar to those of alcohol intoxication, beginning with headache, dizziness, and confusion and progressing with increasing exposure to unconsciousness.[20] Respiratory and circulatory depression can result in death.

Much of what is known about the human health effects of trichloroethylene is based on occupational exposures. Beyond the effects to the central nervous system, workplace exposure to trichloroethylene has been associated with toxic effects in the liver and kidney.[20] Over time, occupational exposure limits on trichloroethylene have tightened, resulting in more stringent ventilation controls and personal protective equipment use by workers.

Research from Cancer bioassays performed by the National Cancer Institute (later the National Toxicology Program) showed that exposure to trichloroethylene is carcinogenic in animals, producing liver cancer in mice, and kidney cancer in rats.[20][21]

The National Toxicology Program's 11th Report on Carcinogens categorizes trichloroethylene as “reasonably anticipated to be a human carcinogen”, based on limited evidence of carcinogenicity from studies in humans and sufficient evidence of carcinogenicity from studies in experimental animals.[22]

One recent review of the epidemiology of kidney cancer rated cigarette smoking and obesity as more important risk factors for kidney cancer than exposure to solvents such as trichloroethylene.[23] In contrast, the most recent overall assessment of human health risks associated with trichloroethylene states, "[t]here is concordance between animal and human studies, which supports the conclusion that trichloroethylene is a potential kidney carcinogen".[24] The evidence appears to be less certain at this time regarding the relationship between humans and liver cancer observed in mice, with the US NAS suggesting that low-level exposure might not represent a significant liver cancer risk in the general population.

The health risks of trichloroethylene have been studied extensively. The U.S. Environmental Protection Agency (EPA) sponsored a "state of the science" review of the health effects associated with exposure to trichloroethylene.[25] The National Academy of Sciences concluded that evidence on the carcinogenic risk and other potential health hazards from exposure to TCE has strengthened since EPA released their toxicological assessment of TCE, and encourages federal agencies to finalize the risk assessment for TCE using currently available information, so that risk management decisions for this chemical can be expedited.[24]

In Europe, the Scientific Committee on Occupational Exposure Limit Values (SCOEL) recommends for trichloroethylene an occupational exposure limit (8 hour time-weighted average) of 10 ppm and a short-term exposure limit (15 min) of 30 ppm.[26]

Human exposure

Exposure to TCE occurs mainly through contaminated drinking water. With a specific gravity greater than 1 (denser than water), trichloroethylene can be present as a dense non-aqueous phase liquid (DNAPL) if sufficient quantities are spilled in the environment. Another significant source of vapor exposure in Superfund sites that had contaminated groundwater, such as the Twin Cities Army Ammunition Plant, was by showering. TCE readily volatilizes out of hot water and into the air. Long, hot showers would then volatilize more TCE into the air. In a home closed tightly to conserve the cost of heating and cooling, these vapors would then recirculate.

The first known report of TCE in groundwater was given in 1949 by two English public chemists who described two separate instances of well contamination by industrial releases of TCE.[27] Based on available federal and state surveys, between 9% to 34% of the drinking water supply sources tested in the U.S. may have some TCE contamination, though EPA has reported that most water supplies are in compliance with the maximum contaminant level (MCL) of 5 ppb.[28] In addition, a growing concern in recent years at sites with TCE contamination in soil or groundwater has been vapor intrusion in buildings, which has resulted in indoor air exposures, such is in a recent case in the McCook Field neighborhood of Dayton, Ohio, United States.[29] Trichloroethylene has been detected in 852 Superfund sites across the United States,[30] according to the Agency for Toxic Substances and Disease Registry (ATSDR). Under the Safe Drinking Water Act of 1974, and as amended[31] annual water quality testing is required for all public drinking water distributors. The EPA'S current guidelines for TCE are online.[32] The EPA's table of "TCE Releases to Ground" is dated 1987 to 1993, thereby omitting one of the largest Superfund cleanup sites in the nation, the North IBW in Scottsdale, Arizona. Earlier, TCE was dumped here, and was subsequently detected in the municipal drinking water wells in 1982, prior to the study period.[33]

In 1986, and later again in 2009, 2 plumes containing trichloroethylene with found on Long Island, New York due to Northrop Grumman's Bethpage factories that worked in conjunction with the United States Navy during the 1930s and 1940s.[34]

In 1988, the EPA discovered tons of TCE that had been leaked or dumped into the ground by the United States military and semiconductor industry (companies including Fairchild Semiconductor, Intel Corporation, and Raytheon Company)[35] just outside NASA Ames in Moffett Field, Mountain View, California.[36]

In 1987, Hill Air Force Base, in Layton, Utah, was declared a Superfund site in 1987 and added to the U.S. Environmental Protection Agency's National Priorities List. [37] Contamination of TCE has been detected in the groundwater throughout Weber County, Utah. [38] While at least 11 significant cancer clusters have been identified in the areas of TCE contamination, there has been no acknowledgment of a direct link between groundwater contamination and specific cancers.

In 1990, Fort Ord, CA was added to the EPA's National Priorities List.[39] Veterans have linked trichloroethylene as the underlying cause for high incidence rates of multiple myeloma.[40]

In 1998, the View-Master factory supply well in Beaverton, Oregon was found to have been contaminated with high levels of TCE. It was estimated that 25,000 factory workers had been exposed to it from 1950 to 2001.[41]

In the case of Lisle, Illinois, releases of trichloroethylene (TCE) had allegedly occurred on the Lockformer property beginning in 1968 and continuing for an undetermined period. The company used TCE in the past as a degreaser to clean metal parts. Contamination at the Lockformer site is presently under investigation by the U.S. Environmental Protection Agency (USEPA) and Illinois EPA.[42] In 1992, Lockformer conducted soil sampling on their property and found TCE in the soil at levels as high as 680 parts per million (ppm). During the summer of 2000, a group of residents hired legal counsel, and on October 11, 2000, these residents had their private well water tested by a private environmental consultant. The group owned homes south of the Lockformer property in the suspected path of groundwater flow. The consultant collected a second round of well water samples on November 10, 2000, and TCE was detected in some of the wells sampled. Beginning in December 2000, Illinois EPA collected about 350 more private well water samples north and south of the Lockformer property.[43]

As of 2007, 57,000 pounds, or 28.5 tons of TCE have been removed from the system of wells that once supplied drinking water to the residents of Scottsdale, Arizona.[44] One of the three drinking water wells previously owned by the City of Phoenix and ultimately sold to the City of Scottsdale, tested at 390 ppb TCE when it was closed in 1982.[45] The City of Scottsdale recently updated its website to clarify that the contaminated wells were "in the Scottsdale area," and amended all references to the measured levels of TCE discovered when the wells were closed (including "390 ppb") to "trace".[46]

Marine Corps Base Camp Lejeune[47] in North Carolina may be the largest TCE contamination site in the country. Legislation could force the EPA to establish a health advisory and a national public drinking water regulation to limit trichloroethylene.[48]

For over 20 years of operation, RCA Corporation had been pouring toxic wastewater into a well in its Taoyuan City, Taiwan facility. The pollution from the plant was not revealed until 1994, when former workers brought it to light. Investigation by the Taiwan Environmental Protection Administration confirmed that RCA had been dumping chlorinated organic solvents into a secret well and caused contamination to the soil and groundwater surrounding the plant site. High levels of TCE and tetrachloroethylene (PCE) can be found in groundwater drawn as far as two kilometers from the site. An organization of former RCA employees reports 1375 cancer cases, 216 cancer deaths, and 102 cases of various tumors among its members.[49][50]

In June 2012, residents of an area off of Stony Hill Road, Wake Forest, NC were contacted by the EPA and DWQ about possible TCE contamination after authorities followed up on existing TCE contamination in 2005. Subsequent EPA testing found multiple sites with detectable levels of TCE and several with levels above the MCL.[51][52]

The 1998 film A Civil Action dramatizes the EPA lawsuit Anne Anderson, et al., v. Cryovac, Inc. concerning trichloroethylene contamination that occurred in Woburn, Massachusetts in the 1980s.

In February 2020, McClymonds High School in West Oakland, California was temporarily closed after trichloroethylene was found in groundwater beneath the school.[53]

United States

Until recent years, the US Agency for Toxic Substances and Disease Registry (ATSDR) contended that trichloroethylene had little-to-no carcinogenic potential, and was probably a co-carcinogen—that is, it acted in concert with other substances to promote the formation of tumors.

State, federal, and international agencies classify trichloroethylene as a known or probable carcinogen. In 2014, the International Agency for Research on Cancer updated its classification of trichloroethylene to Group 1, indicating that sufficient evidence exists that it causes cancer of the kidney in humans as well as some evidence of cancer of the liver and non-Hodgkin's lymphoma.[54] California EPA regulators consider it a known carcinogen and issued a risk assessment in 1999 that concluded that it was far more toxic than previous scientific studies had shown.

European Union

In the European Union, the Scientific Committee on Occupational Exposure Limit Values (SCOEL) recommends an exposure limit for workers exposed to trichloroethylene of 10 ppm (54.7 mg/m3) for 8-hour TWA and of 30 ppm (164.1 mg/m3) for STEL (15 minutes).[55]

Existing EU legislation aimed at protection of workers against risks to their health (including Chemical Agents Directive 98/24/EC[56] and Carcinogens Directive 2004/37/EC[57]) currently do not impose binding minimum requirements for controlling risks to workers health during the use phase or throughout the life cycle of trichloroethylene. However, in case the ongoing discussions under the Carcinogens Directive will result in setting of a binding Occupational Exposure Limit for trichloroethylene for protection of workers; this conclusion may be revisited.

The Solvents Emissions Directive 1999/13/EC[58] and Industrial Emissions Directive 2010/75/EC[59] impose binding minimum requirements for emissions of trichloroethylene to the environment for certain activities, including surface cleaning. However, the activities with solvent consumption below a specified threshold are not covered by these minimum requirements.

According to European regulation, the use of trichloroethylene is prohibited for individuals at a concentration greater than 0.1%. In industry, trichloroethylene should be substituted before April 21, 2016 (unless an exemption is requested before October 21, 2014)[60] by other products such as tetrachloroethylene (perchloroethylene), methylene chloride (dichloromethane), or other hydrocarbon derivatives (ketones, alcohols, ...).

Proposed U.S. federal regulation

In 2001, a draft report of the Environmental Protection Agency (EPA) laid the groundwork for tough new standards to limit public exposure to trichloroethylene. The assessment set off a fight between the EPA and the Department of Defense (DoD), the Department of Energy, and NASA, who appealed directly to the White House. They argued that the EPA had produced junk science, its assumptions were badly flawed, and that evidence exonerating the chemical was ignored.

The DoD has about 1,400 military properties nationwide that are contaminated with trichloroethylene. Many of these sites are detailed and updated by and include a former ammunition plant in the Twin Cities area.[61] Twenty three sites in the Energy Department's nuclear weapons complex—including Lawrence Livermore National Laboratory in the San Francisco Bay area, and NASA centers, including the Jet Propulsion Laboratory in La Cañada Flintridge are reported to have TCE contamination.

Political appointees in the EPA sided with the Pentagon and agreed to pull back the risk assessment. In 2004, the National Academy of Sciences was given a $680,000 contract to study the matter, releasing its report in the summer of 2006. The report has raised more concerns about the health effects of TCE.

In response to the heightened awareness of environmental toxins such as TCE and the role they may be playing in childhood disease, in 2007, Senator Barack Obama proposed S1068, co-sponsored by Hillary Clinton and John Kerry.[62] This legislation aimed to inform and protect communities that are threatened with environmental contamination. Senator Clinton's own bill, S1911, is known as the TCE Reduction Act.

Reduced production and remediation

In recent times, there has been a substantial reduction in the production output of trichloroethylene; alternatives for use in metal degreasing abound, chlorinated aliphatic hydrocarbons being phased out in a large majority of industries due to the potential for irreversible health effects and the legal liability that ensues as a result.

The U.S. military has virtually eliminated its use of the chemical, purchasing only 11 gallons in 2005.[63] About 100 tons of it is used annually in the U.S. as of 2006.[64]

Recent research has focused on the in-place remediation of trichloroethylene in soil and ground water instead of removal for off-site treatment and disposal. Naturally-occurring bacteria have been identified with the ability to degrade TCE. Dehalococcoides sp. degrade trichloroethylene by reductive dechlorination under anaerobic conditions. Under aerobic conditions, Pseudomonas fluorescens can co-metabolize TCE. Soil and ground water contamination by TCE has also been successfully remediated by chemical treatment and extraction. The bacteria Nitrosomonas europaea can degrade a variety of halogenated compounds including trichloroethylene.[65] Toluene dioxygenase has been reported to be involved in TCE degradation by Pseudomonas putida.[66] In some cases, Xanthobacter autotrophicus can convert up to 51% of TCE to CO and CO2.[66]


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Further reading

  • Agency for Toxic Substances and Disease Registry (ATSDR). 1997. Toxicological Profile for Trichloroethylene. link
  • Doherty, Richard E. (2000). "A History of the Production and Use of Carbon Tetrachloride, Tetrachloroethylene, Trichloroethylene and 1,1,1-Trichloroethane in the United States: Part 2 – Trichloroethylene and 1,1,1-Trichloroethane". Environmental Forensics. 1 (2): 83–93. doi:10.1006/enfo.2000.0011. S2CID 97370778.
  • Lipworth, Loren; Tarone, Robert E.; McLaughlin, Joseph K. (2006). "The Epidemiology of Renal Cell Carcinoma". The Journal of Urology. 176 (6): 2353–2358. doi:10.1016/j.juro.2006.07.130. PMID 17085101.
  • U.S. Environmental Protection Agency (USEPA). 2011. Toxicological Review for Trichloroethylene
  • U.S. National Academy of Sciences (NAS). 2006. Assessing Human Health Risks of Trichloroethylene – Key Scientific Issues. Committee on Human Health Risks of Trichloroethylene, National Research Council. link
  • U.S. National Toxicology Program (NTP). 2005. Trichloroethylene, in the 11th Annual Report of Carcinogens. link
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