Abstract
Abstract A gas chromatographic (GC) method was developed for determination of dimethoate residues In chrysanthemums and soil. Dry flowers, fresh flowers, and leaves of chrysanthemum and soil samples are extracted with acetone, cleaned up by coagulation, and partitioned with dlchloromethane. Dimethoate is determined by GC with nitrogenphosphorus detection. Recovery ranges of dimethoate from samples of dry flowers, fresh flowers, and leaves of chrysanthemums are 86.7-91.0% (fortified at 0.5-2.0 ppm), 88.1-93.6% (fortified at 0.036- 0.721 ppm), and 83.3-96.9% (fortified at 0.5-1.31 ppm), respectively. Recovery ranges of dimethoate from soil samples are 93.0-104% (fortified at 0.125- 0.327 ppm). Average recoveries of the 4 kinds of samples (n = 9) are 88.4 ± 8.94%, 91.5 ± 4.18%, 91.1 ± 4.69%, and 97.3 ± 5.1 %, respectively
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