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Solid phase extraction of halogenated pesticides from ground and surface waters and their determination by capillary gas chromatography

✍ Scribed by Báez, María E. ;Lastra, Olga ;Rodríguez, Manuel

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
479 KB
Volume
19
Category
Article
ISSN
0935-6304

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✦ Synopsis

Abstract

A critical study of a solid phase extraction method using C~18~ SPE columns for the determination of 23 halogenated pesticides is presented. Type of sorbent, sorbent mass, flow rate in the extraction process, sample concentration of the different compounds, sample volume, pH, ionic strength and type of water were evaluated. Recoveries of pesticides under study yield a linear relationship, except for conazole fungicides and captan. Losses can be expected for heptachlor, aldrin, and captan. Sample volume and flow rate of extraction affect recoveries. Matrix effects from surface and groundwaters were observed. Recoveries for vinelozolin and dieldrin from groundwater were lower than those obtained from nanopure water. In river water losses of these compounds are higher. Captan and penconazole were not present and high losses were obtained for trifluralin, α‐BHC, γ‐BHC, tri‐allate and chlorpyriphos. Impurities arising from the sorbent materials of cartridges have been detected.

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