EFFECT OF A COMPONENT FROM FOODS ON THE DETERMINATION OF BENFURACARB AND CARBOSULFAN BY GAS-CHROMATOGRAPHY

A separative determination method of benfuracarb, carbosulfan, carbofu ran and 3-hydroxycarbofuran in agricultural products by GC and HPLC wa s developed. When benfuracarb and carbosulfan in raw extract or slight ly cleaned-up extracts of foods were measured by GC, almost all of the m was not recovered, though a corresponding amount of carbofuran was d etected. On the other hand, when the same GC test solutions were measu red by HPLC, benfuracarb and carbosulfan were quantitatively recovered regardless of the degree of cleanup (with or without Sep-pak Silica o r Florisil) of the test solution. Accordingly, benfuracarb and carbosu lfan in test solution coexisting with food components were decomposed to carbofuran during GC analysis, and the degree of the decomposition depended on the kind of foods. In order to prevent the decomposition, it was necessary to clean-up the test solutions for benfuracarb and ca rbosulfan sufficiently.