Residues in Corn and Soils Treated with Technical Chlordane and High-Purity Chlordane (HCS 3260)1

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Abstract
Mature corn grain and cobs grown in soils treated at planting with 1 and 2 lb active ingredient per acre of technical chlordane or HCS 3260 (high purity chlordane) were free of detectable insecticide residues (limit of sensitivity = 0.008 ppm). The stalk contained trace quantities of alpha- and/or gamma-chlordane. Whole corn plants harvested as for silage, 102 days after planting, contained about 0.03-0.04 ppm combined alpha- and gamma- chlordane, while heptachlor and heptachlor epoxide were not detected. Maximum ppm total residues in the upper 4 inches of soil were approximately twice the treatment rate in pounds in the case of technical chlordane and 3-4 times the treatment rate of HCS 3260. Fifty to 70% of these residues had dissipated after 1 year.

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