a particular disinfection-by-product (Hoehn, 1996).
Trihalomethanes are byproducts of chlorine, which is used to disinfect water, and carbon-based plant debris in the water. Chloroform is the best known example. THMs cause 10,000 cases of colon and bladder cancer annually. The chlorine industry strenuously opposes closer regulation of THMs.
a general term given to a group of substances that contain three halogens (chlorine, fluorine, bromine or iodine)
simple halogenated organic compounds such as chloroform and bromodichloromethane.
THM's are formed in water when chlorine reacts with small amounts of naturally occurring organic matter. THM's are measured in mg/L.
Byproduct of chlorinating water that contains natural organics. Recent U.S. Environmental Protection Agency changes in national drinking water quality standards now require that water treatment systems begin to reduce TTHM.
A group of volatile organic compounds containing one carbon atom, one hydrogen atom, and three halide (fluorine, chlorine, bromine, and iodine) atoms. Common THMs include chloroform, bromoform, and dichlorofluoromethane. These compounds can be a result of chlorination processes in water-supply wells.
a class of volatile organic chemicals created as a result of water chlorination.
organic chemicals containing chlorine which are formed when chlorine is added to drinking water or wastewater for disinfection; some of these are known to be hazardous to human health.
Collectively referred to as disinfection by-products; formed when chlorine reacts with decomposing plant material. The allowable amounts found in drinking water are regulated by the EPA.
THMs are formed during the disinfection process by reaction between chlorine and mainly naturally-occurring organic substances. Treatment processes are controlled to minimise their production. See the DWI web site for information on the control of THMs. 100 µg/l
Formed during the disinfection of water with free chlorine.
Organic compounds which may be harmful to health at certain levels in drinking water.
A class of chemical organic compounds that are chlorination by-products formed when organic matter naturally present in surface water reacts with the chlorine added during the disinfection process (chlorine treatment of drinking water).
Chlorinated by-products of wastewater disinfection processes.
Trihalomethanes, or THM s, are produced when water is disinfected with chlorine and the chlorine reacts with naturally occurring organic matter found in all waters. Tucson groundwater contains very low levels of natural organic matter which accounts for the extremely low levels of THMs in the Tucson Water distribution system. The federal primary drinking water standard for THMs is 80 parts per billion. The levels in Tucson Water's distribution system are far below this level.
A group of disinfection byproducts that includes chloroform, bromodichloromethane, bromoform, and dibromochloromethane.
Trihalomethanes are formed when chlorine reacts with organic matter in water, such as from decaying leaves. They have been linked to a higher incidence of cancer. A filter with activated carbon rated for THM reduction is an effective treatment.
A group of suspected carcinogenic, or cancer causing organic chemicals produced by the reaction of chlorine and organic chemicals or materials.
(THM) by-products of chlorination of water containing organics which are suspected carcinogens
A group of chemical organic substances that contain halogen elements (i.e., chlorine, fluorine, bromine, etc.) attached to three positions on a methane molecule. These compounds are derived from many sources and are toxic when found in more than trace amounts. THMs are a by-product of the chlorinated process to disinfect water when organic compounds are present.
Four separate compounds including chloroform, dichlorobromomethane, dibromochloromethane, and bromoform.