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Solid phase microextraction as an efficient method for characterization of the interaction of pesticides with different soil types

2010; Brazilian Chemical Society; Volume: 21; Issue: 6 Linguagem: Inglês

10.1590/s0103-50532010000600007

1678-4790

Rada Djurovic-Pejcev, Jelena Gajić-Umiljendić, Svjetlana B. Cupać, Lj. M. Ignjatović,

Pharmaceutical and Antibiotic Environmental Impacts

Foi desenvolvido um metodo de microextracao em fase solida (SPME) para determinacao simultânea de 20 pesticidas, pertencentes a varios grupos, em amostras de solo. Foram investigadas condicoes de extracao como tipo de fibra, temperatura e tempo de dessorcao, tempo de extracao e teor de NaCl. A deteccao e quantificacao foram realizadas por cromatografia gasosa acoplada a espectrometria de massas (CG-MS). Os resultados indicam que a maioria dos pesticidas estudados foram mais fortemente sorvidos por solos com maior teor de materia orgânica ou argila. Os valores de desvio padrao relativo (DPR) para analises multiplas de amostras de solo fortificadas com 30 μg kg -1 de cada pesticida ficaram abaixo de 19%. Os limites de deteccao (LD) para todos os compostos estudados foram menores do que 5 μg kg -1 . A solid phase microextraction (SPME) method for simultaneous determination of 20 pesticides belonging to various pesticide groups in soil samples was developed. Extraction conditions, such as fibre type, desorption temperature and time, extraction time and NaCl content were investigated. Detection and quantification were done by gas chromatography-mass spectrometry (GC-MS). The results indicate that most of the studied pesticides were more strongly sorbed by soil that has higher organic matter and/or clay content. Relative standard deviation (RSD) values for multiple analysis of soil samples fortified at 30 μg kg -1 of each pesticide were below 19%. Limits of detection (LOD) for all the compounds studied were less than 5 μg kg -1