DETERMINATION OF ORGANOPHOSPHORUS AND ORGANONITROGEN PESTICIDES IN WATER AND SEDIMENTS BY GC-NPD AND GC-MS (CORRECTED VERSION OF LA014)

An analytical procedure has been developed for the determination of or ganophosphorus (OP) and organonitrogen (ON) compounds in the aquatic e nvironment (water, sediments). OP and ON were analysed by a gas chroma tography apparatus (GC) equipped with cool on-column injectors and cou pled either with a nitrogen-phosphorus detector (NPD) or with a mass s elective detector (MSD) in electron impact (EI) and positive chemical ionisation (PCI) modes. Chromatographic retention indexes based on a s eries of organonitrogen internal standards were defined for GC-NPD in order to confirm analytes in environmental samples. Atrazine, simazine and diazinon were identified in surface waters by GC-NPD and GC-MS.