What are different organochlorine compounds that cause water pollution? Give their main sources. Why are these present in traces in raw and treated water?

Organochlorine compounds are a group of organic compounds that contain chlorine atoms bonded to carbon atoms. Many organochlorine compounds are known to cause water pollution due to their persistence and harmful effects on aquatic ecosystems and human health. Here are some common organochlorine compounds that cause water pollution, along with their main sources:

1. Dichloro-Diphenyl-Trichloroethane (DDT):

   • Source: DDT is an insecticide that was widely used in agriculture and for malaria control. It has been banned or severely restricted in many countries.
   • Presence in Water: DDT can enter water bodies through runoff from treated agricultural fields and from improper disposal. It is present in trace amounts in water due to its persistence in the environment.

2. Polychlorinated Biphenyls (PCBs):

   • Source: PCBs were used in electrical equipment, hydraulic fluids, and as _________ ______ ______ ____ _____ _____ __________ _________ ________ ____.
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