分析化学Issue(3)：429-432,4.DOI:10.11895/j.issn.0253-3820.140666
分散液液微萃取结合测汞仪分析水产食品中甲基汞
Determination of Methylmercury in Seafood after Dispersive Liquid-liquid Microextraction by Direct Mercury Analyzer
摘要
Abstract
A method for the determination of methylmercury in seafood has been developed using dispersive liquid-liquid microextraction followed by direct mercury analyzer. Total mercury was detected by direct mercury analyzer, and inorganic mercury was calculated by the difference. The parameters affecting the extraction efficiency, including the selection of extractant and dispersant, their volume ratio, concentration of HCl and NaCl have been optimized in this study. The results showed that CH2 Cl2 as extractant, ethanol as dispersant, volumn ration of 1:5, 1 mol/L HCl and 120 g/L NaCl were chosen. The detection limit and the dynamic liner range were 0. 10 μg/L and 0. 2-20 μg/L, respectively. The relative standard deviation was 6. 0% for eleven replicates at the spiked level of 2. 0 μg/L. The enrichment factor was 8. For total Hg determination, the detection limit and the dynamic liner range for methylmercury were 0. 10 μg/kg and 0. 2-50 μg/kg, respectively. The relative standard deviation was 2. 4%. The method was simple, fast and a little solvent needed. Some certified reference materials were analyzed to validate the accuracy of the proposed method, and the results were in good agreement with the reference value. Besides, the method was applied to the real samples with satisfactory results.关键词
分散液液微萃取/测汞仪/甲基汞Key words
Dispersive liquid-liquid microextraction/Direct mercury analyzer/Methylmercury引用本文复制引用
段建坤,林建国,叶咏薇,方慧文,毛宏敏..分散液液微萃取结合测汞仪分析水产食品中甲基汞[J].分析化学,2015,(3):429-432,4.基金项目
本文系国家质检总局科技计划项目(No.2012QK151) （No.2012QK151）
