SOLID PHASE EXTRACTION (SPE) IN TWO LAYERS CARTRIDGE FOR SIMULTANEOUS ANALYSIS OF MEDIUM AND HIGHLY POLAR PESTICIDES IN WATERS

摘要

HPLC-DAD and GC-NPD methods were developed to measure medium and highly polar pesticide concentrations in ground and surface waters. To analyse these pesticides in relation with the European Directives, a comparison of different "off-line" solid phase extraction sorbents was carried out. The use of a home-made (SPE) two layers poly(divinylbenzene-co-N-vinylpyrrolidone) - octadecyl-bonded silica (Oasis-C18) cartridge allows to analyse simultaneously medium and highly polar pesticides in natural waters, with quantification limits between 0.03 and 0.05 μg/l according to each pesticide. The recoveries on this sorbent vary between 90 and 105 with R.S.D. below 7 in MilliQ water and between 88 and 115 with R.S.D. below 20 , except for bentazone (26 ), in surface water.