Cyanopropyl Bonded-Phase Cartridges for Trace Enrichment of Dioxins and Chlorinated Pesticides from Water Samples

Gas chromatography of dioxins and chlorinated pesticides in water samples has been performed after adsorption from 50 to 100 mL sample on to a cartridge containing 100 mg cyanopropyl-bonded porous silica. The dioxins and chlorinated pesticides were desorbed with 2 mL carbon disulfide, which is concentrated and analysed by gas chromatography coupled with an electron-capture detector. The average recovery of 0.20 ng mL(-1) of each chlorinated pesticide and of 0.50 ng mL(-1) of each dioxin from distilled water and river water samples (50 mL) is a parts per thousand yen97.2% with a standard deviation (SD) a parts per thousand currency sign 2.6. In the dioxin separation from chlorinated pesticides the recovery of dioxins at levels of 0.1-0.5 ng mL(-1) is a parts per thousand yen97.9% with a SD a parts per thousand currency sign 1.3, with traces of aldrin, heptachlorepoxide and 4,4'-DDD (a parts per thousand currency sign1.7%) by the CN-Sep-Pak cartridge, while the recovery of chlorinated pesticides at levels of 0.05-0.2 ng mL(-1) is a parts per thousand yen97.4% with a SD a parts per thousand currency sign 1.5, with traces of hep-dioxin (2.4%) and penta-dioxin (1.0%) by the C(18)-Sep-Pak cartridge connected in series to the CN-Sep-Pak cartridge.