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Simultaneous Extraction of Six Pesticides Using a Dual-Column Extraction Procedure

Dep. of Agronomy, 116 Agric. Sci. and Industry Bldg, The Pennsylvania State Univ., University Park, PA 16802;
Dep. of Entomology, 501 Agric. Sci. and Industry Bldg., The Pennsylvania State Univ., University Park, PA 16802.

^* Corresponding author.

ABSTRACT

A method was developed that allowed for the simultaneous extraction of six pesticides (three chloro-s-triazines, a substituted amide, an organic phosphate, and a benzoic acid derivative) from either soil or water samples. This method utilizes two types of solid-phase extraction columns, one reverse phase, and one anion exchange column, connected in series to extract all six compounds from a single sample. After separate elution of the two columns, high pressure liquid chromatography was employed to analyze the benzoic acid derivative utilizing a C-18 column and paired ion techniques with a detection limit of 6 µg L^–1. A gas chromatograph, equipped with a N-P detector, was used to analyze the remaining five compounds. The detectable limit for the chloro-s-triazines was 3 µg L^–1 while the detection limit of the substituted amide was 6 µg L^–1.

(current address: USDA-ARS, Coastal Plains Research Center, P.O. Box 3039, Florence, SC 29502)

Received for publication March 5, 1993.