Mercury speciation by differential photochemical vapor generation at UV-B vs. UV-C wavelength

文献类型： 外文期刊

第一作者： Chen, Guoying

作者： Chen, Guoying;Lai, Bunhong;Mei, Ni;Liu, Jixin;Mao, Xuefei

作者机构：

关键词： Mercury;Speciation;UV-C;UV-B;Photochemical vapor generation;Fish oil

期刊名称：SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY （ 影响因子：3.752； 五年影响因子：3.375 ）

ISSN： 0584-8547

年卷期： 2017 年 137 卷

页码：

收录情况： SCI

摘要： Photochemical vapor generation (PVG) is an effective sample introduction scheme for volatile mercury (Hg). Speciation of Hg++ and MeHg+ was fulfilled for the first time by differential PVG under UV-B vs. UV-C wavelength and applied to fish oil supplements. After liquid-liquid extraction, the aqueous extract was mixed with 0.4% anthranilic acid (AA)-20% formic acid (FA) in a quartz coil, and exposed sequentially to 311 nm or 254 nm UV light. The resulting Hg-0 vapor was detected by atomic fluorescence spectrometry (AFS). At each wavelength, the AFS intensity was a linear function of Hg++ and MeHg+ concentrations, which were solvable from a set of two equations. This method achieved ultrahigh sensitivity with 0.50 and 0.63 ng mL(-1) limits of detection for Hg++ and MeHg+, respectively, and 73% recovery for MeHg+ at 10 ng mL(-1). Validation was performed by ICP-MS on total Hg. Obviation of chemical or chromatographic separation rendered this method rapid, green, and cost-effective. Published by Elsevier B.V.

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