期刊
ANALYTICA CHIMICA ACTA
卷 665, 期 1, 页码 55-62出版社
ELSEVIER
DOI: 10.1016/j.aca.2010.03.004
关键词
Dispersive liquid-liquid microextraction; Pesticides; Liquid chromatography-tandem mass spectrometry; Sample preparation; Aqueous samples
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Financiadora de Estudos e Projetos (FINEP)
- Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul (FAPERGS)
In this study, a simple, rapid and efficient method has been developed for the extraction and preconcentration of different classes of pesticides, carbofuran (insecticide), clomazone (herbicide) and tebuconazole (fungicide) in aqueous samples by dispersive liquid-liquid microextraction (DLLME) coupled with liquid chromatography-tandem mass spectrometric detection. Some experimental parameters that influence the extraction efficiency, such as the type and volume of the disperser solvents and extraction solvents, extraction time, speed of centrifugation, pH and addition of salt were examined and optimized. Under the optimum conditions, the recoveries of pesticides in water at spiking levels between 0.02 and 2.0 mu g L-1 ranged from 62.7% to 120.0%. The relative standard deviations varied between 1.9% and 9.1% (n = 3). The limits of quantification of the method considering a 50-fold preconcentration step were 0.02 mu g L-1. The linearity of the method ranged from 1.0 to 1000 mu g L-1 for all compounds, with correlation coefficients varying from 0.9982 to 0.9992. Results show that the method we propose can meet the requirements for the determination of pesticides in water samples. The comparison of this method with solid-phase extraction indicates that DLLME is a simple, fast, and low-cost method for the determination of pesticides in natural waters. (C) 2010 Elsevier B.V. All rights reserved.
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