Hydrology, Environment (Surface Geochemistry) The mercury isotope composition of Arctic coastal seawater
Hydrology, Environment (Surface Geochemistry) The mercury isotope composition of Arctic coastal seawater
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DOI：
10.1016/j.crte.2015.04.001
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发表时间：
2015-11
期刊：
影响因子：
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通讯作者：
M. Štrok;P. Baya;H. Hintelmann
中科院分区：
文献类型：
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作者：
M. Štrok;P. Baya;H. Hintelmann
首次报道了加拿大北极群岛海水中汞的同位素组成。收集后立即在科考船上用阴离子交换树脂对大量海水取样中的汞进行预浓缩。采用多收集器电感耦合等离子体质谱法（MC-ICP-MS）测定汞同位素组成。为了进行比较，来自两个站点的海水被运送到实验室并在实验室中进行处理。结果表明，δ 202hg在-2.85 ~ -1.10‰范围内呈负质量依赖分馏，而奇数Hg同位素呈轻微的正质量依赖分馏。还观察到200hg的正质量独立分离。在实验室预浓缩的样品显示出不同的汞同位素特征，这很可能是由于在采样后的储存和运输过程中，有机物在黑暗中对汞进行了非生物还原。这强调了立即机载预浓缩的必要性。
For the first time, Hg isotope composition of seawater in the Canadian Arctic Archipelago is reported. Hg was pre-concentrated from large volumes of seawater sampling using anion exchange resins onboard the research vessel immediately after collection. Elution of Hg was performed in laboratory followed by isotope composition determination by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). For comparison, seawater from two stations was shipped to the laboratory and processed within it. Results showed negative mass-dependent fractionation in the range from –2.85 to –1.10‰ forδ202Hg, as well as slightly positive mass-independent fractionation of odd Hg isotopes. Positive mass-independent fractionation of200Hg was also observed. Samples that were pre-concentrated in the laboratory showed different Hg isotope signatures and this is most probably due to the abiotic reduction of Hg in the dark by organic matter during storage and shipment after sampling. This emphasizes the need for immediate onboard pre-concentration.