Abstract
Abstract The official first action high pressure (HPLC) and gas-liquid (GLC) chromatographic methods for the determination of methyl parathion were adapted to analyze technical parathion, and 25 and 50% parathion emulsifiable concentrates. A technical parathion sample was analyzed and then used to prepare 5 of the 6 collaborative samples. At a 95% confidence level, only 1 of the 10 means was significantly different from the theoretical value. There was no significant difference in the CLC and HPLC means for each sample. The average of the coefficients of variation for the 6 CLC determinations (15 collaborators) was 0.86%. For the HPLC determinations (8 collaborators), the average was 0.81%.
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