Abstract
Abstract The 2 methods collaboratively studied were a gas-liquid chromatographic (GLC) method, using either a flame photometric or a flame ionization detector, a column packed with 3% OV-225 on 80-100 mesh Chromosorb W (HP), and an internal standard; and a paper chromatographic (PC/C) method in which the chromatographed spot is combusted and the formothion content is determined colorimetrically as phosphorus. Four samples of formothion, 50% technical solution, 25 and 33% emulsifiable concentrates, and 70% ultralow volume formulation, were studied. Collaborative results for the GLC method (5 collaborators for 3 samples and 7 collaborators for 1 sample) were satisfactory, with standard deviations ranging from 0.57 to 1.42. PC/C values (3 collaborators) were higher but still satisfactory, with standard deviations ranging from 1.50 to 5.22. Both methods have been adopted as full CIPAC methods, with the GLC method as the reference method. The GLC method has been adopted as official first action by the AOAC.
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