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Optimization of Solid Phase Microextraction Procedure Followed by Gas Chromatography with Electron Capture Detector for Pesticides Butachlor and Chlorpyrifos

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American Journal of Analytical Chemistry 2014年第9期5卷 535-546页

作者： Fateme Ghavidel Seyed Jamaleddin Shahtaheri Reza Khani Jazani marzieh torabbeigi Abbas Rahimi Froushani Monireh Khadem Department of Epidemiology and Biostatistics School of Public Health Tehran University of Medical Sciences Tehran Iran Department of Occupational Health Engineering School of Public Health Tehran University of Medical Sciences Tehran Iran Faculty of Health Safety and Environment Shahid Beheshti University of Medical Sciences Tehran Iran Institute for Environmental Research Tehran Iran

In this study, headspace solid phase microextraction (HS-SPME) followed by gas chromatography using electron capture detection system (GC-ECD) were developed for the determination of chloraacetanilide (butachlor) and chlorpyrifos presented in biological samples. Different parameters affecting the extraction procedure were optimized including extraction time (30 minutes), extraction temperature (80°C), sample volume (3 mL), sample pH (2), added NaCl (0.3 gram) and sample stirring rate (400 rpm). Different concentrations of 1 - 100 ng/ml were applied for butachlor and a linear calibration curve was obtained. Furthermore, a similar linearity was obtained for chlorpyrifos, using a concentration range of 1 - 250 ng/ml. The limit of detection (LOD) obtained for butachlor and chlorpyrifos were 0.088 and 0.53 ng/ml respectively. The optimized methods for both compounds were validated using two concentrations of 25 and 50 ng/ml in spiked urine samples. Obtained recoveries of spiked urine samples were 83.06% - 99.8% with RSD of lower than 11%. Optimized technique was simple, inexpensive, solvent free and fast in comparison with other conventional methods and had compatibility with the chromatographic analytical system. This method offers low detection limits to analyze pesticides in urine samples that are very important in the exposure monitoring in occupational health.

关键词： HS-SPME GC-ECD Biological Samples Chlorpyrifos Butachlor

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