Simultaneous Determination of Pesticides by Solid-phase Extraction/High-Performance Liquid Chromatography

A method for simultaneous determination of asulam, mecoprop, oxin-copper, thiram, bensu-lid, iprodione and pencycuron in environmental water, was developed. In this method, these seven pesticides were concentrated from water using polystyrene-gel minicartridge (PS-2), and determined by HPLC with a GOLF-PAK column. When this method was applied to environmental water samples collected monthly from April 1994 to March 1995 at 11 sampling points in Chiba Prefecture, many interfering peaks were observed. In order to remove these interfering peaks, two columns of GOLF-PAK and Inertsil ODS-3 were used for environmental water samples. By using of these two columns, no interfering peaks were observed, and the peaks of the seven pes-ticides were detected clearly. When this two-columns method applied to the same samples collected from Chiba Prefecture, no peaks of these seven pesticides was detected in all of them.