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Dimethoate Residues in Eggs and Tissues of Laying Hens1

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Hens were administered technical and emulsifiable dimethoate at a concentration of 30 ppm in drinking water for 59 weeks and then placed on untreated water. Eggs and tissues from hens slaughtered while on treatment, and 7, 14, 22, and 34 days after removal from treatment, were analyzed by a microcolorimetric method originally described for the analysis of diazinon, which involves the conversion of the thiono sulfur to methylene blue, which is determined spectrophotometrically at 670 mµ. The corrected limit of detectability for the various tissues were: yolk and albumin 0.122 ppm, breast muscle 0.052 ppm, fat 0.069 ppm, and liver 0.144 ppm. Residues beyond the sensitivity of the method were found only in the breast muscle of hens fed technical dimethoate and slaughtered while on treatment and 7 days after removal from treatment.

Document Type: Research Article

Publication date: December 1, 1967

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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