New monitoring system for ninety pesticides and related compounds in riverwater by solid-phase extraction with determination by gas chromatography/mass spectrometry

A new monitoring system was established for the determination of 90 pestici des and 10 pesticide degradation products in river water. The pesticides co nsisted of 18 fungicides, 30 insecticides, and 42 herbicides. The pesticide s were extracted with a solid-phase, styrene-divinylbenzene copolymer, elut ed with acetone, hexane, and ethyl acetate, and determined by gas chromatog raphy/mass spectrometry. Overall recoveries ranged from 72 to 118%. The lim its of detection were 0.01-0.1 mu g/L. This system determines most of the p esticides used in Japan and was successfully applied to practical monitorin g of water polluted with pesticides and related compounds.