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International Journal of Environmental Analytical Chemistry Volume 85, 2005 - Issue 4-5: Proceedings of the 11th Symposium on Sample Handling for Environmental and Biological Analysis Guest Editor: Ana Gago
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Original Articles

Determination of organochlorine pesticides in horticultural samples by microwave assisted extraction followed by GC-ECD

Mercedes Barriada-Pereira University Institute of Environment. Pazo de Lóngora, Liáns, Oleiros, A Coruña, E-15179, Spain; Department of Analytical Chemistry, University of A Coruña, Campus da Zapateira, s/n, E-15071, A Coruña, Spain
,
María José González-Castro Department of Analytical Chemistry, University of A Coruña, Campus da Zapateira, s/n, E-15071, A Coruña, Spain
,
Soledad Muniategui-Lorenzo Department of Analytical Chemistry, University of A Coruña, Campus da Zapateira, s/n, E-15071, A Coruña, SpainCorrespondence[email protected]
,
Purificación López-Mahía University Institute of Environment. Pazo de Lóngora, Liáns, Oleiros, A Coruña, E-15179, Spain; Department of Analytical Chemistry, University of A Coruña, Campus da Zapateira, s/n, E-15071, A Coruña, Spain
,
Darío Prada-Rodríguez University Institute of Environment. Pazo de Lóngora, Liáns, Oleiros, A Coruña, E-15179, Spain; Department of Analytical Chemistry, University of A Coruña, Campus da Zapateira, s/n, E-15071, A Coruña, Spain
&
Esther Fernández-Fernández Department of Analytical Chemistry, University of A Coruña, Campus da Zapateira, s/n, E-15071, A Coruña, Spain
Pages 325-333 | Received 23 Jun 2004, Accepted 01 Dec 2004, Published online: 25 Jan 2007
 
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Abstract

A method to determine 21 organochlorine pesticides in horticultural samples (lettuce, pepper, tomato, spinach and potato) based on microwave assisted extraction (MAE) followed by solid-phase extraction (SPE) clean-up is described. After extraction with hexane : acetone (50 : 50), a carbon cartridge was employed for the clean-up step. Pesticides were eluted with 5 mL of hexane : ethyl acetate (80 : 20) and determined by gas chromatography and electron capture detection (GC-ECD). Results were confirmed by GC-MS analysis. Analytical recoveries obtained were ca. 100% for most of the studied pesticides with the proposed method in each analysed matrix. The method was applied to analyse 35 commercial samples from A Coruña (NW Spain); only two samples contained pesticide residues, but none of them exceeded the MRLs established by EU legislation.

Acknowledgements

The authors wish to thank the University of A Coruña for its financial support.

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