Chlorpyrifos, Its Oxygen Analogue, and 3,5,6-Trichloro-2-Pyridinol: Residues in the Body Tissues of Turkeys Confined in Pens on Treated Soil2

Abstract

Turkeys were confined in a pen on soil that was sprayed with chlorpyrifos wettable powder at 4 pounds active ingredient per acre (4.48 kg per hectare). A portion of the soil was treated again 28 days later with the same dosage. Residues in fat, skin, muscle, liver, and kidney were determined for chlorpyrifos and 3,5,6-trichloro-2-pyridinol, a likely metabolite; and in fat, skin, and muscle for the oxygen analogue (diethyl 3,5,6-trichloro-2-pyridyl phosphate). Maximum residues of chlorpyrifos (0.055 ppm in fat, 0.152 ppm in skin, and 0.005 ppm in kidney) were detected 7 days after the first application; no oxygen analogue was detected. Residues of O.003-0.16; ppm pyridinol were found in skin, liver, and kidney tissues of some turkeys at 7 days after both the 1st and the 2nd applications. No increase in the residues of either material above the levels found at 7 days after the first treatment resulted from the second treatment.