Abstract
Environmental contamination by the organochlorine pesticides such as BHC, DDT, and cyclodiene compounds has become of interest to many reseachers. The extensive survey on pesticide residue in river waters was initiated by the establishment of the surveillance system by U. S. Department of the Interior, Federal Water Pollution Control Administration, and various reports have been published by many reseachers [i.e., BREIDENBACH and LICHTENBERG (1963), WEAVER et al. (1965), and BREIDENBACH et al. (1967)]. Recently, SCHULZE et al. (1973) reported the levels of the organochlorine pesticide in the streams of the Western United States during 1968 and 1971, and DDT was the most frequently detected insecticide in their results. Also KAHANOVITCH and LAHAV (1974) reported that the most widespread compounds in the water samples of Israel were gamma-BHC and alpha-BHC, and concluded that municipal sewage was an important source of BHC residue in the water bodies.
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