Microwave-assisted extraction versus Soxhlet extraction in the analysis of 21 organochlorine pesticides in plants |
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Authors: | Barriada-Pereira M Concha-Graña E González-Castro M J Muniategui-Lorenzo S López-Mahía P Prada-Rodríguez D Fernández-Fernández E |
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Institution: | University Institute of Environment, Department of Analytical Chemistry, University of A Coruña, Campus da Zapateira s/n, E-15071, A Coruña, Spain |
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Abstract: | A method to determine 21 organochlorine pesticides in vegetation samples using microwave-assisted extraction (MAE) is described and compared with Soxhlet extraction. Samples were extracted with hexane–acetone (1:1, v/v) and the extracts were cleaned using solid-phase extraction with Florisil and alumine as adsorbents. Pesticides were eluted with hexane–ethyl acetate (80:20, v/v) and determined by gas chromatography and electron-capture detection. Recoveries obtained (75.5–132.7% for Soxhlet extraction and 81.5–108.4% for MAE) show that both methods are suitable for the determination of chlorinated pesticides in vegetation samples. The method using microwave energy was applied to grass samples from parks of A Coruña (N.W. Spain) and to vegetation from the contaminated industrial area of Torneiros (Pontevedra, N.W. Spain). |
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Keywords: | Extraction methods Microwave-assisted extraction Plant materials Environmental analysis Pesticides Organochlorine compounds |
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