SCREENING ANALYSIS FOR MULTIPLE PESTICIDE -RESIDUES IN AGRICULTURAL PRODUCTS WITH THE GC MS-SCAN METHOD/

A simple and rapid screening analysis for multiple pesticide residues in agricultural products was developed. It is an especially effective mean for detection in analyzing food with much interference because th e reliability confirmation of substances is greatly improved over the SIM method. A sample is extracted with acetone and reextracted with a non-polar solvent by salting out. We used 50% ethyl acetate/hexane as a non-polar solvent. The extract was cleaned up by GPC with ethyl acet ate: cyclohexane (1 : 1) as eluent. We used Bio Beads S-X3 (200 simila r to 400 mesh) as a GPC gel. Measurements of GC/MS were performed in t he scanning mode. We could confirm substances with mass spectra at hig h background levels, such as food, and perform with only one injection to the instrument without grouping pesticides, as in the case of the CC/MS-SIM method. Due to these merits, we could increase the reliabili ty and decrease the time consumption. We could analyze as a screening analysis 102 kinds of pesticides. The detection limits in the samples were from 0.004 to 0.05 mu g/g.