Multi-residue analysis by liquid chromatography-mass spectrometry coupling. Application to drinking and river waters

The coupling between liquid chromatography and mass spectrometry with an APCI or ESI interface tin positive or negative mode) is used here for multi-residue analyses in natural waters, covering basic and neutral pesticides as well as acid pesticides. The: methods developed are applied to drinking and, river waters after the samples are concentrated by liquid-liquid extraction or solid phase extraction on C18 cartridges. Comparisons are made between UV detection and mass spectrometry and between two chromatographic methods for acid substances. The quantitation limits range from 0.01 to 0.1 mug/l according to the substance.