ONLINE SOLID-PHASE EXTRACTION LIQUID-CHROMATOGRAPHY, PARTICLE-BEAM MASS-SPECTROMETRY, AND GAS-CHROMATOGRAPHY MASS-SPECTROMETRY OF CARBAMATEPESTICIDES

On-line solid-phase extraction-liquid chromatography-particle beam mas s spectrometry (SPE-LC-PB-MS) was used to study 32 carbamates and 11 o f their transformation products in environmental water samples, The an alytes were enriched from 100 ml samples on Bondesil-C-18/OH, packed i n a 10 mm x 3.0 mm id precolumn, eluted on-line with a gradient of met hanol-0.1 mol l(-1) ammonium acetate to a C-18 analytical column and d etected by PB-MS, Detection limits of 12 carbamates and five degradati on products were 0.1-8 mu g l(-1) in surface water, using full-scan el ectron impact mode detection, The RSDs of the retention times were 0.0 5-0.2% and those of peak areas 5-35%, Twenty-eight analytes proved to be amenable to GC with detection limits of 0.05-3 ng injected on-colum n, When using the same mass spectrometer, the spectra obtained by LC-P B-MS and GC-MS were identical.