Abstract
Abstract Captan is extracted from inert substances with a solution containing dieldrin in dioxane. The GLC procedure is stated in performance requirements except to specify XE-60 packing in a glass column. The ratio of captan to HEOD peak heights is measured for the sample and compared to the same ratio calculated for standard captan. Effects of extraction, peak measuring technique, sample size variation, and captan degradation on column and in solution were investigated. Twenty chemists from 18 laboratories quantitatively measured captan content of 6 samples. The coefficient of variation for the 2 technicals was 3.67%, for the two 50% wettable powders, 2.07%, and for the 10% dusts, 5.78%. A significant amount of systematic error was detected. Submitted chromatograms of a standard injection revealed that if captan degraded, as detected by formation of tetrahydrophthalimide, answers were often outliers rejected by the Dixon test. The method has been adopted as official first action and it is recommended that the problem of captan degradation be studied further.
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