Abstract
This study is a meta-analysis of four experiments with two pyrethroids, cypermethrin and cyfluthrin, in two formulations, emulsifiable concentrates and wettable powders. Contributions of fabric weight, detergent type, and detergent concentration are evaluated for residue remaining in fabrics after laundering. Each of the four experiments is a factorial experiment, with two fabric weights (10 ozlyd2 and 14.5 ozlyd2), two detergent types (heavy-duty liquid and phosphate) and four detergent concentrations ( 0.0x, 0.5x, 1.0x, and 1.5x, where x = package label recommendations). Fabric specimens were contaminated, laundered, and residues remaining after laundering determined gas chromatographically. The heavier the fabric, the more residues were retained. Cypermethrin was more completely removed by laundering than was cyfluthrin. The emulsifiable concentrate formulation was more difficult to remove than the wettable-powder formulation. The cyfluthrin emulsifiable concentrate residue was greater following laundering than other pesticides. Increasing detergent concentration was effective in reducing cyfluthrin residue. Detergent type should be selected according to pesticide formulation: a heavy-duty liquid detergent for the emulsifiable-concentrate and a phosphate, powdered detergent for the wettable-powder.
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