Heptachlor and Its Metabolite: Accumulation and Degradation in Sediment

Organic pesticides were developed during and after World War II to displaced inorganic and metal organic substances such as sulfur, arsenic, sodium fluoride and boric acid, which used by society for thousands of year. Some of these pesticides were OCPs which are organic compounds that contain chlorine. These OCPs were preferred because of their effective against the target pests even if only small amount was applied to the environment. Neither small amounts of chemicals should enter the environment; however, the organic substances are generally much less toxic to human than the inorganic and metal organic compounds.