N-Nitrosodimethylamine (NDMA), also known as dimethylnitrosamine (DMN), is a semi-volatile organic chemical, produced as by-product of several industrial processes and present at very low levels in certain foodstuffs, especially those cooked, smoked, or cured. NDMA is water-soluble, yellow in color, and has little or no taste and odor. It is toxic to the liver and other organs and is a probable human carcinogen. It is also used to create cancer in rats for cancer research.
|Preferred IUPAC name
3D model (JSmol)
|Molar mass||g·mol−1 74.083|
|Appearance||Yellow, oily liquid|
|Boiling point||153.1 °C; 307.5 °F; 426.2 K|
|290 mg/ml (at 20 °C)|
|Vapor pressure||700 Pa (at 20 °C)|
Refractive index (nD)
Std enthalpy of
|Main hazards||Known carcinogen, extremely toxic|
|GHS signal word||DANGER|
|H301, H330, H350, H372, H411|
|P260, P273, P284, P301+310, P310|
|Flash point||61.0 °C (141.8 °F; 334.1 K)|
|Lethal dose or concentration (LD, LC):|
LD50 (median dose)
|37.0 mg/kg (oral, rat)|
|US health exposure limits (NIOSH):|
IDLH (Immediate danger)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
NDMA is a yellow, oily liquid with a faint, characteristic odor and a sweet taste. It is an industrial by-product or waste product of several industrial processes, such as manufacturing of unsymmetrical dimethylhydrazine (UDMH), which is a component of rocket fuel that requires NDMA for its synthesis. Of more general concern, water treatment by chlorination or chloramination of organic nitrogen-containing wastewater can lead to the production of NDMA at potentially harmful levels. Further, NDMA can form or be leached during treatment of water by anion exchange resins. Finally, NDMA is found at low levels in numerous items of human consumption, including cured meat, fish, beer, tobacco smoke and as an impurity in pharmaceuticals. It is, however, unlikely to bioaccumulate.
N-Nitrosodimethylamine is highly toxic, especially to the liver, and is a known carcinogen in lab animals. The EPA classifies NDMA as a probable human carcinogen. The US Environmental Protection Agency has determined that the maximal admissible concentration of NDMA in drinking water is 7 ng/l. The EPA has not yet set a regulatory maximal contaminant level (MCL) for drinking water. At high doses, it is a "potent hepatotoxin that can cause fibrosis of the liver" in rats. The induction of liver tumors in rats after chronic exposure to low doses is well documented. Its toxic effects on humans are inferred from animal experiments but not well-established experimentally.
NDMA's contamination of drinking water is of particular concern due to the minute concentrations at which it is harmful, the difficulty in detecting it at these concentrations, and to the difficulty in removing it from drinking water. It does not readily biodegrade, adsorb, or volatilize. As such, it cannot be removed by activated carbon and travels easily through soils. Relatively high levels of UV radiation in the 200 to 260 nm range breaks the N–N bond and can thus be used to degrade NDMA. Additionally, reverse osmosis is able to remove approximately 50% of NDMA.
It is classified as an extremely hazardous substance in the United States as defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act (42 U.S.C. 11002) and is subject to strict reporting requirements by facilities that produce, store, or use it in significant quantities.
As a poisonEdit
Several incidents in which NDMA was used to intentionally poison another person have garnered media attention. In 1978, a teacher in Ulm, Germany was sentenced to life in prison for trying to murder his wife by poisoning jam with NDMA and feeding it to her. Both the wife and the teacher later died from liver failure.
In 1978, Steven Roy Harper spiked lemonade with NDMA at the Johnson family home in Omaha, Nebraska. The incident resulted in deaths of 30-year-old Duane Johnson and 11-month-old Chad Sheldon. For his crime, Harper was sentenced to death but committed suicide in prison before his execution could be carried out.
In the 2013 Fudan poisoning case, Huang Yang, a postgraduate medical student at Fudan University, was the victim of a poisoning in Shanghai, China. Huang was poisoned by his roommate Lin Senhao, who had placed NDMA into the water cooler in their dormitory. Lin claimed that he only did this as an April Fool's joke. He received a death sentence and was executed in 2015.
- "NIOSH Pocket Guide to Chemical Hazards #0461". National Institute for Occupational Safety and Health (NIOSH).
- David L. Sedlak, Rula A. Deeb, Elisabeth L. Hawley, William A. Mitch, Timothy D. Durbin, Sam Mowbray and Steve Carr (2005). "Sources and Fate of Nitrosodimethylamine and Its Precursors in Municipal Wastewater Treatment Plants". Water Environment Research. 77 (1, Emerging Micropollutants in Treatment Systems (Jan.–Feb. 2005)): 32–39. doi:10.2175/106143005X41591. JSTOR 25045835.CS1 maint: Uses authors parameter (link)
- Najm, I.; Trussell, R. R. (2001). "NDMA Formation in Water and Wastewater". Journal American Water Works Association. 93 (2): 92–99. doi:10.1002/j.1551-8833.2001.tb09129.x. ISSN 0003-150X.[permanent dead link]
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- Peto, R.; Gray, R.; Brantom, P.; Grasso, P. (1991). "Dose and Time Relationships for Tumor Induction in the Liver and Esophagus of 4080 Inbred Rats by Chronic Ingestion of N-Nitrosodiethylamine or N-Nitrosodimethylamine" (PDF). Cancer Research. 51 (23 Part 2): 6452–6469. PMID 1933907.
- Mitch, W. A.; Sharp, J. O.; Trussell, R. R.; Valentine, R. L.; Alvarez-Cohen, L.; Sedlak, D. L. (2003). "N-Nitrosodimethylamine (NDMA) as a Drinking Water Contaminant: A Review". Environmental Engineering Science. 20 (5): 389–404. CiteSeerX 10.1.1.184.204. doi:10.1089/109287503768335896.
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- Ein teuflischer Plan: Tod aus dem Marmeladeglas (in German).
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- Man admits to poisoning fellow researcher in Kingston.
- Nitrosodimethylamine (NDMA) Information
- CDC - NIOSH Pocket Guide to Chemical Hazards
- Method Development for the Determination of N-Nitrosodimethylamine (NDMA) in Drinking Water
- SFPUC NDMA White Paper
- Public Health Statement for n-Nitrosodimethylamine
- Toxicological Profile for n-Nitrosodimethylamine CAS# 62-75-9