Development of an Analytical Method for Fenitrothion and Five Derivatives in Water using XAD Resins and Gas Liquid Chromatography (GLC)

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Abstract
The recovery from water of fenitrothion and five possible metabolites was studied using Amberlite XAD-4 and-7 resins followed by GLC analysis. Details are given for the syntheses of s-methylfenitrothion, formylfenitrothion, aminofenitrothion and hydroxymethy fenitrothion. The results show that fenitrothion and three derivatives namely aminofenitrothion, fenitrooxon and s-methylfenitrothion may be recovered from water using either XAD-4 or 7 with expected recoveries over 90% However both formylfenitrothion and hydroxymethylfenitrothion were poorly recovered under the same conditions. The individual recovery of hydroxymethyfenitrothion could be improved to over 90% when the compound was alone and the concentration was reduced. The technique of GLC using a flame photometric detector in the phosphorous mode proved to be efficient for the separation of a mixture of six components. The detection limits were 0.5 to 3.5 ng per injection.