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Microcombustion Method for the Determination of Carbon-14-Labeled Pesticide Residues in Soil¹

ABSTRACT

A dry combustion procedure commonly used for total carbon analysis was modified and used to determine the concentration of ¹⁴C-labeled pesticides in soil. Modifications included replacement of the Ascarite®³ CO₂ trap with a solution of an organic base compatible with liquid scintillation solvents, and minor carrier gas flow changes. Recovery of three pesticides from four soils ranged from 83 to 99% and averaged 94%.

¹ Contribution from the USDA-ARS, Western Region, in cooperation with Colorado Agr. Exp. Sta., P.O. Box E, Fort Collins, Colo. 80522. Scientific Journal Series No. 1956.

² Chemist and Soil Scientist, respectively.

Received for publication August 5, 1974. Accepted for publication September 25, 1974.