Cyanopropyl Bonded-Phase Cartridges for Trace Enrichment of Dioxins and Chlorinated Pesticides from Water Samples |
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Authors: | Mario Vincenzo Russo Pasquale Avino Ivan Notardonato Giuseppe Cinelli |
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Institution: | 1. Facoltà di Agraria (DISTAAM), Università del Molise, Via De Sanctis, 86100, Campobasso (CB), Italy
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Abstract: | 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 ≥97.2% with a standard deviation (SD) ≤ 2.6. In the dioxin separation from chlorinated pesticides the recovery of dioxins at levels of 0.1–0.5 ng mL?1 is ≥97.9% with a SD ≤ 1.3, with traces of aldrin, heptachlorepoxide and 4,4′-DDD (≤1.7%) by the CN-Sep-Pak cartridge, while the recovery of chlorinated pesticides at levels of 0.05–0.2 ng mL?1 is ≥97.4% with a SD ≤ 1.5, with traces of hep-dioxin (2.4%) and penta-dioxin (1.0%) by the C18-Sep-Pak cartridge connected “in series” to the CN-Sep-Pak cartridge. |
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