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Determination of Organonitrogen Pesticides in Large Volumes of Surface Water by Liquid–liquid and Solid-phase Extraction Using Gas Chromatography with Nitrogen–phosphorus Detection and Liquid Chromatography with Atmospheric Pressure Chemical Ionization Mass Spectrometry by Hassan Sabik; Roger Jeannot is a Chemistry article available to read on EtoBox.

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During a recent study to determine the fluxes and fates of contaminants in the St. Lawrence River, the majority of organonitrogen pesticides analysed in samples of surface water were found in the dissolved phase. This paper compares two extraction techniques and two analytical techniques for 10 chemicals (metolachlor, seven triazines and two degradation products of atrazine-cyanazine-propazine and simazine) in the dissolved phase in large volumes of surface water, using a fibre glass filter with 0.7 mm porosity. Samples of filtered surface water (1-20 l) were extracted by means of a liquid-liquid technique using the Goulden large-sample extractor, and by means of a solid-phase extraction technique, using cartridges filled with 500 mg of a large particle-size graphitized carbon black as adsorbent: Carbopack B (500-666 mm). The pesticides were analysed by gas chromatography on two DB-5 and DB-210 capillary columns with nitrogen-phosphorus detection (GC-NPD) and by liquid chromatography coupled with mass spectrometry equipped with an atmospheric pressure chemical ionization interface (LC-APCI-MS). The recoveries were high (67-100%) for the majority of the target pesticides in a volume

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Author

Hassan Sabik; Roger Jeannot

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-3778)

Published

1998

Language

EN

Field

Chemistry (Physical Sciences)