Determination of O,O-diethyl O-3,5,6-trichloro-2-pyridyl phosphorothioate in water and silt by gas chromatography

Abstract

A gas chromatographic method for determining residues of O,O-diethyl 0-3,5,6-trichloro-2-pyridyl phosphorothioate (Dursban insecticide) in water and silt is described. Samples were extracted with methylene chloride and cleanup was accomplished with a silicic acid column. Residues as low as 0.0001 p.p.m. in water and 0.005 p.p.m. in silt were determined by gas chromatography using nonpolar stationary phase columns and electron-capture

Pesticide residues

“…Rice and Dishburger (192) determined residues of Dursban in water and silt by GLC. Samples were extracted with methylene chloride and cleanup was accomplished with a silicic acid column.…”

Determination of Dursban insecticide in water, mud, vegetation, fish, ducks, innsects, and crustacea

“…Vegetation. The method for extraction and cleanup of aquatic grass samples was that used by Rice and Dishburger (1968) for oysters, with minor modifications. It includes blending with acetone, transfer to hexane, partitioning into acetonitrile, then back into hexane, and column chromatography using a silicic acid column eluted with 20% methylene chloride in hexane.…”