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作 者:李妍[1] 刘书娟[1] 江冬青[1] 江焱[1] 严秀平[1]
机构地区:[1]南开大学化学学院分析科学研究中心,天津300071
出 处:《分析化学》2008年第6期793-798,共6页Chinese Journal of Analytical Chemistry
基 金:973计划(No.2003CB415001);南开大学科技创新基金资助项目
摘 要:对气相色谱(GC)与电感耦合等离子体质谱(ICP-MS)联用的商品化接口进行了改进,并将GC-ICP-MS联用技术应用于水产品中汞的形态分析。在优化条件下,甲基汞(MeHg(Ⅰ))和乙基汞(EtHg(Ⅰ))的检出限(S/N=3)分别为0.5pg和1.0pg,定量限(S/N=8)分别为1.5pg和2.8pg,标准曲线的线性范围为1~1000pg。对三文鱼肉、金枪鱼肉和角鲨鱼肉3种标准物质和市售14种鱼贝类水产品,采用非衍生的样品预处理,进行汞的形态分析。结果表明,采集样品中均检出有甲基汞,未检测出乙基汞,甲基汞的含量在3.7~236.6ng/g(以Hg计)范围,甲基汞的加标回收率为91%~102%。A method was developed for mercury speciation in seafoods by on-line coupling gas chromatography to inductively coupled plasma mass spectrometry with an improved interface. The detection limits ( S/N = 3 ) of methylmercury ( MeHg( I ) ) and ethylmercury ( EtHg( I ) ) were 0.5 and 1.0 pg ( as Hg), respectively. The quantitative limits (S/N = 8) were 1.5 pg and 2.8 pg for MeHg( I ) and EtHg( I ), respectively. The linear range for the determination of methylmercury and ethylmercury was 1 - 1000 pg. The hybrid technique was applied for the speciation analysis of mercury in two certified reference materials, 14 fish and shellfish samples collected from local markets. The measured MeHg(I) concentrations were 3.7 ng/g - 236.6 ng/g (as Hg), and no EtHg( I ) was detected. The standard addition recovery of MeHg( I ) in real samples was 91% -102%.
关 键 词:气相色谱 电感耦合等离子体质谱 汞形态 联用技术 水产品
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