Comprehensive analysis for major, minor and trace element contents and Sr-Nd-Pb-Hf isotope ratios in sediment reference materials, JSd-1 and MAG-1
Comprehensive analysis for major, minor and trace element contents and Sr-Nd-Pb-Hf isotope ratios in sediment reference materials, JSd-1 and MAG-1
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DOI：
10.2343/geochemj.1.0018
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发表时间：
2009-06
影响因子：
0.8
通讯作者：
-B.;Nagender Nath;A. Makishima;J. Noordmann;R. Tanaka;E. Nakamura
中科院分区：
文献类型：
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作者：
-B.;Nagender Nath;A. Makishima;J. Noordmann;R. Tanaka;E. Nakamura
考虑到对表征良好、易于获取的水系沉积物标准物质的要求，对日本地质调查局发布的水系沉积物标准物质JSd-1进行了含50种主要、少量和微量元素以及Sr - Nd - Pb - Hf同位素的综合分析。还获得了美国地质调查局发布的海洋沉积物参考材料MAG-1的数据进行比较。这些元素被分为两组：第一组和第二组。I族元素在HNO3中形成稳定的可溶离子；II族化合物在HF中形成可溶的氧和氟配合物，如Zr、Nb、HF、Ta等。对于第一组，样品在四氟乙烯（TFE）弹中以HF分解，在245°C下，添加Mg，分解96小时。采用同位素稀释-内标准化（ID-IS）方法，采用四极杆型电感耦合等离子体源质谱法（ICP-QMS）和扇形场型等离子体质谱法（ICPSFMS）测定元素浓度。对样品溶液进行三步柱化学分析，用多收集器ICP-MS和热电离质谱法分别测定Pb和Sr、Nd的同位素比值。对于II族元素，样品在相同时间和温度设置的TFE弹中用HF分解。采用ICP-QMS法测定Zr、Mo、Sn、Sb和Hf，采用ID- is法测定Nb和Ta。原JSd-1粉末中II族元素呈非均匀性，说明粉化和分布不充分。因此，我们进一步粉碎了粉末并测量了浓度，均匀性得到了改善。再粉碎粉末的同分物经两步柱化学处理，用MC-ICP-MS测定Hf同位素比值。从而为JSd-1和MAG-1的微量元素和Sr - Nd - Pb - Hf同位素比值提供了新的数据。
In view of the requirement of a well-characterized and easily available aquatic sediment reference material, a comprehensive analysis comprising of fifty major, minor and trace elements as well as Sr‐Nd‐Pb‐Hf isotopes were carried out in the stream sediment reference material, JSd-1, issued by the Geological Survey of Japan. The data for marine sediment reference material, MAG-1, issued by U.S. Geological Survey is also obtained for comparison. The elements were divided into two groups: Group I and Group II. Elements in Group I form stable soluble ions in HNO3; and those in Group II form soluble oxo- and fluoro-complexes in HF, such as Zr, Nb, Hf, Ta, etc. For Group I, the sample was decomposed with HF in a tetra fluoro ethylene (TFE) bomb at 245°C for 96 hrs with Mg addition. The elemental concentration was measured by quadrupole type inductively coupled plasma source mass spectrometry (ICP-QMS) and sector field type ICP-MS (ICPSFMS) using isotope dilution-internal standardization (ID-IS) methods. The aliquot of the sample solution was passed through 3-step column chemistry for isotope ratio determination of Pb by multiple collector (MC) ICP-MS and thermal ionization mass spectrometry (TIMS), and Sr and Nd by TIMS. For Group II elements, the sample was decomposed with HF in a TFE bomb with the same time and temperature settings. Zr, Mo, Sn, Sb and Hf were determined by ID, and Nb and Ta by ID-IS using ICP-QMS. The original JSd-1 powder showed heterogeneity for Group II elements, indicating insufficient pulverization and distribution. Thus, we further pulverized the powder and measured the concentration, which showed improved homogeneity. The aliquot for the re-pulverized powder was passed through 2-step column chemistry, and the Hf isotope ratio was determined by MC-ICP-MS. Thus a new data on the trace elements as well as Sr‐Nd‐Pb‐Hf isotope ratios is provided for JSd-1 and MAG-1 in this paper.