Analysis of crops and soils for residues of the soil insecticides aldrin and ‘Telodrin’

摘要

AbstractAldrin (2 lb/acre) and ‘Telodrin’ (0.5 lb/acre) were applied as emulsifiable concentrates to plots once in 1961 or in three annual applications 1961‐3. Residues taken up into cabbage, carrots, celery, onions, potatoes and sugar‐beet, and those remaining in the soil have been determined by electron‐capture gas–liquid chromatography.The insecticide residue level in all crops was less than 0·1 ppm. Residues were found in crops grown in loam soils but not in peat, and only in the root crops (carrots, potatoes and sugar‐beet). Crop residues did not increase markedly with annual re‐treatment, but levels greater than 0·01 ppm continued to occur in carrots grown in loam soils in later seasons when treatment was not repeated.Residues were lost rapidly from soil immediately following application, dropping to about 15 of the initial values after a year, but loss thereafter was at a