Semiautomated Determination of Pesticides in Water Using Solid Phase Extraction Disks and Gas Chromatography−Mass Spectrometry

Cristiana C. Leandro,†‡ Dawn A. Bishop,† Richard J. Fussell,*† Frankie D. Smith,† and Brendan J. Keely‡
Central Science Laboratory, Sand Hutton, York, YO41 1LZ, United Kingdom, and University of York, Heslington, York, YO10 5DD, United Kingdom
J. Agric. Food Chem., 2006, 54 (3), pp 645–649
DOI: 10.1021/jf051874d
Publication Date (Web): January 13, 2006
Copyright © 2006 American Chemical Society
†

 Central Science Laboratory.

,
‡

 University of York.

,
*

 To whom correspondence should be addressed. E-mail:  r.fussell@ csl.gov.uk.

Abstract

A method based on semiautomated solid phase extraction using octadecyl-bonded silica disks and gas chromatography−mass spectrometry, operated in selected ion monitoring mode, allows detection and quantification of approximately 100 pesticides and transformation products in drinking water. Samples (500 mL) were passed through the disk, and the retained pesticides were eluted with acetone and ethyl acetate. Typical recoveries for pesticides at 0.1 μg L-1 in water were in the range of 72−120% with relative standard deviations less than 20%. Calibration curves were linear over the range of 0.025−0.5 μg mL-1 (equivalent to a concentration range in drinking water of 0.05−1.0 μg L-1).

Keywords: SPEDEX; SPE disks; gas chromatography; mass spectrometry; analysis of drinking water; pesticide residues

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History

  • Published In Issue February 08, 2006
  • Received for review August 1, 2005. Revised manuscript received November 24, 2005. Accepted December 1, 2005. We gratefully acknowledge Defra (Department for Environment Food and Rural Affairs) for funding.

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