Among the most serious chemical pollutants are chlorinated hydrocarbon pesticides, fertilizers, polychlorinated biphenyls ( PCBs ), which are or were used in a variety of industrial processes and in the manufacture of many kinds of materials; and metals such as mercury, lead, cadmium, and arsenic.
42.
Working under Justus von Liebig at Gie�en, Regnault distinguished himself in the nascent field of organic chemistry by synthesizing several chlorinated hydrocarbons ( e . g . vinyl chloride, polyvinylidene chloride, dichloromethane ), and he was appointed professor of chemistry at the University of Lyon.
43.
It was somewhat effective against the boll weevil, Anthonomus grandis, which entered the United States from Mexico and devastated the cotton industry in the 1890s, but the standard treatment was another arsenic compound, calcium arsenate, and the long-snouted beetle was finally controlled by the less expensive chlorinated hydrocarbons and organic phosphates and by changes in farming like earlier planting and use of resistant varieties.
44.
Big changes came as far back as 1988 when the government took chlordane and chlorinated hydrocarbons ( DDT, lindane ) off the market after they were found to be health hazards to humans as well as many animals . " When they took those off, we found out that some of the products we were left with were not as effective as we thought they were, " Sapp said.
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