On-line solid-phase extraction liquid chromatography, particle beam mass spectrometry, and gas chromatography mass spectrometry of carbamate pesticides

On-line solid-phase extraction-liquid chromatography-particle beam mass spectrometry (SPE-LC-PB-MS) was used to study 32 carbamates and 11 of their transformation products in environmental water samples, The analytes were enriched from 100 ml samples on Bondesil-C-18/OH, packed in a 10 mm x 3.0 mm id precolumn, eluted on-line with a gradient of methanol-0.1 mol l(-1) ammonium acetate to a C-18 analytical column and detected by PB-MS, Detection limits of 12 carbamates and five degradation products were 0.1-8 mu g l(-1) in surface water, using full-scan electron impact mode detection, The RSDs of the retention times were 0.05-0.2% 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-column, When using the same mass spectrometer, the spectra obtained by LC-PB-MS and GC-MS were identical.