Abstract
Abstract A spectrophotometric method for the analysis of sulfoxide formulation was studied by six collaborators. The method consists of separating the sulfoxide from other components by column chromatography on silicic acid with three successive eluting solutions: chloroform, 2% acetone in chloroform, and 1 0% acetone in chloroform. Sulfoxide is removed in the last eluate and is determined by UV spectrophotometry. Solvents, emulsifiers, pyrethrins, compounds related to sulfoxide, and other insecticides are separated by the column. Results on standard samples of four formulations showed good agreement between samples and laboratories with the exception of one sample which, because of its complex nature and low sulfoxide content, resulted in poor correlation within and between the laboratories. It is recommended that the method for the assay of sulfoxide formulations be adopted as official, first action.
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