Abstract
Abstract A collaborative study was conducted to compare the official volumetric method for parathion with the first action colorimetric method, as revised. Two samples of 15% powders were tested. Simultaneously one sample of methyl parathion was submitted to each collaborator for analysis by the above methods and by an infrared procedure. Based on statistical analysis of collaborative results, the revised colorimetric method is recommended for adoption as official, final action; further study of methods for methyl parathion is considered necessary.
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