Reflux open-vessel digestion system can overcome volatilization loss in mercury speciation analysis

文献类型： 外文期刊

第一作者： Chen, Guoying

作者： Chen, Guoying;Lai, Bunhong;Mao, Xuefei

作者机构：

关键词： Seafood digestion; Open-vessel; Mercury speciation analysis; Reflux; Condensation

期刊名称：TALANTA （ 影响因子：6.057； 五年影响因子：5.386 ）

ISSN： 0039-9140

年卷期： 2019 年 191 卷

页码：

收录情况： SCI

摘要： Volatilization loss of analytes in open-vessel digestion is a concern for mercury speciation analysis. Loss of Hg-0 vapour can be overcome by using oxidative digestion media, while loss of aerosols can be circumvented by complete condensation under sub-boiling-point heating. Using a simple system that consisted of a block heater and culture tubes, two digestion protocols were developed for determination of total Hg (tHg) and inorganic Hg (iHg). The resulting Hg++ was selectively reduced by SnCl2 to Hg-0, which was detected by atomic fluorescence spectrometry (AFS). MeHe was oxidized to Hg++ to yield tHg and calculated from the difference. These methods were validated using certified reference material (CRM) DORM-4, and applied to seafood analysis with 3.6 and 3.2 ng g(-1) (dry weight) limit of detection for iHg and tHg, respectively. Using only off-the-shelf components, these methods gained cost, simplicity, and parallel operation advantages.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序