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Solid-phase extraction of pesticide residues from ground water: comparison between extraction cartridges and extraction discs

✍ Scribed by J. Beltran; F.J. López; F. Hernández

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
544 KB
Volume
283
Category
Article
ISSN
0003-2670

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✦ Synopsis

Gctadecyl (C,,) bonded porous silica sorbent cartridges and Empore membrane extraction discs were evaluated for the solid-phase extraction (SPE) of organochlorine (lindane, dicofol, chlorfenson and tetradifon) and organophosphorus pesticides (dimethoate, fenitrothion and methidathion) from ground water. The SOO-mg Cts cartridges quantitatively adsorbed these pesticides, including the most polar (dimethoate), with recoveries ranging from 68 to 113% for a ground water sample spiked at the 0.1 pg I-' level. SPE with 500-mg C,, Empore discs also quantitatively adsorbed the pesticides with recoveries between 73 and 115% for the 0.1 pg I-' level, but only after eluting with 15 ml of ethyl acetate compared with 4 ml using cartridges and a longer analysis time per sample. After elution with ethyl acetate, the extract was concentrated to an appropriate volume, between 100 and 500 ~1, under a gentle stream of nitrogen. Detection limits were lower than 0.1 pg l-', which is currently the mazimum level allowed by the EEC for pesticide residues in drinking water. Determination was effected by capillary gas chromatography using electron-capture and nitrogen-phosphorus detectors.

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