Analytical Method for Ethoprop (Mocap) in Agricultural Crops

Studies on Analysis of Pesticide Residues in Foods. XXXV

Abstract

An analytical method for multiresidues of organochlorine and organophosphorus pesticides, including ethoprop (O-ethyl S, S-dipropylphosphorodithioate, prophos, Mocap^®), a nematocide, in crops was developed.
The method consisted of extraction with a mixture of acetone and n-hexane, clean-up by florisil column chromatography and determination by gas chromatography (GC). The pesticides on the column were eluted with 200ml each of 15% ether in n-hexane and ether. Ethoprop was eluted in the second fraction and determined by FPD-GC, organochlorine pesticides were eluted in the first fraction and determined by ECD-GC, and organophosphorus pesticides were eluted in both fractions and determined by FPD-GC.
A recovery test was carried out by fortification of 5 crops, and the recoveries of ethoprop were in the range of 81% to 95%. The recoveries of organophosphorus pesticides from banana and corn were in the range of 71% to 96%. Furthermore, ethoprop in banana could be identified by GC-MS.