期刊
JOURNAL OF ENVIRONMENTAL SCIENCES
卷 115, 期 -, 页码 403-410出版社
SCIENCE PRESS
DOI: 10.1016/j.jes.2021.08.013
关键词
Mercury speciation; Online solid-phase extraction; HPLC-ICP-MS; Dithizone; Cereals; Natural water
资金
- National Key Research and Development Project [2020YFA0907400]
- National Natural Science Foundation of China [21777178 ,21976193]
- National Young Top-Notch Talents [W03070030]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [Y202011]
A simple and efficient dithizone-functionalized solid-phase extraction (SPE) procedure, online coupled with high-performance liquid chromatography-inductively coupled plasma mass spectrometry, was developed for the first time for enrichment and determination of ultra-trace mercury species in cereals and environmental samples. The developed method offers a robust tool for detecting ultra-trace Hg species and has potential applications in environmental analysis.
A simple and efficient dithizone-functionalized solid-phase extraction (SPE) procedure, online coupled with high-performance liquid chromatography (HPLC)-inductively coupled plasma mass spectrometry, was developed for the first time for enrichment and determination of ultra-trace mercury (Hg) species (inorganic divalent Hg (Hg(II)), methylmercury (CH3Hg(II)) and ethylmercury (C2H5Hg(II)) in cereals and environmental samples. In the proposed method, functionalization of the commercial C-18 column with dithizone, enrichment, and elution of the above Hg species can be completed online with the developed SPE device. A simple solution of 2-mercaptoethanol (1% (V/V)) could be used as an eluent for both the SPE and HPLC separation of Hg species, significantly simplifying the method and instrumentation. The online SPE method was optimized by varying dithizone dose, 2-mercaptoethanol concentration, and sample volume. In addition, the effect of pH, coexisting interfering ions, and salt effect on the enrichment was also discussed. Under the optimized conditions, the detection limits of Hg species for 5 mL water sample were 0.15 ng/L for Hg(II), 0.07 ng/L for CH3Hg(II), and 0.04 ng/L for C2H5Hg(II) with recoveries in the range of 85%-100%. The developed dithizone-functionalized C-18 SPE column can be reused after a single functionalization, which significantly simplifies the enrichment step. Moreover, the stability of Hg species enriched on the SPE column demonstrated its suitability for field sampling of Hg species for later laboratory analysis. This environment-friendly method offers a robust tool to detect ultra-trace Hg species in cereals and environmental samples. (C) 2021 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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