The authors have developed an analytical method for determining trace amounts of 39 kinds of pesticides in water with high precision and accuracy by gas chromatography/ mass spectrometry with a selected ion monitor (GC/ MS-SIM). One liter of water was extracted with dichloromethane; the extract was concentrated to 1 ml with a Kuderna-Danish concentrator. After the internal standards, perdeuterated n-alkanes (C16, C20 and C24), were added to the concentrate, quantitative analyses by GC/ MS-SIM were performed to measure the recovery efficiencies of the 39 compounds spiked into water samples at concentrations of below µg/ 1. The recovery efficiencies of the tested compounds, except monocrotophos and bentazone, yielded more than 95% and their relative standard deviations were less than 6%. The developed method was applied to the determination of pesticides in river and tap water. Sixteen pesticides ranging from ng/ 1 to µg/ l were detected. This method is useful to elucidate the fates and the concentration levels of pesticides in the aquatic environment.

measured and calculated. OV-17 CB-FSC showed the best separability among the three CB-FSCs employed and was applied to analysis of extracts from several soil samples with minimum clean-up procedure. The chromatograms obtained demonstrated steady baseline tracings free of interference.Electron capture gas chromatography with three chemically bonded fused-silica capillary columns (CB-FSCs), OV-17, OV-1701, and SE-52, was performed to evaluate peakseparabilityof 28 organochlorine insecticides and related compounds. Relative retention times and relative peak heights to aldrin were Residue data from soil samples were also tabulated.

A screening method for 34 kinds of organic pollutants such as pesticides and harmful chemicals in water by GC/MS-SIM was developed for investigation of the cause of fish mortality accident. One liter of water sample was extracted with dichloromethane and measured by GC/MS-SIM without future separation. The detection limit of alomst pollutants were decided to 0.01 ƒÊg•Eml-1 according as the toxicity for the fish. The recovery was 67•`117% and 51•`97%with dichloromethane and hexane, respectively. This method was applied to river water from a golf links, as a result CAT, TPN, Flutoluanil and Isoprothiolane were found at ng•Eml-1 level.