Accurate and precise determination of lead isotope composition in selected geochemical reference mat

• 作者: Guangliang Wu Jian-Ming Zhu Decan Tan Guilin Han Lixing Zhang Kun Ren
• 来源期刊: 地球化学学报(英文）
• 关键词: Lead isotopes Geochemical reference materials MC-ICP-MS
• 年，卷（期）: 2017,（3）
• 页码范围: 421-425
• 页数: 4页
• 语种: 英文
• DOI: 10.1007/s11631-017-0181-3

摘要

Lead (Pb) isotopes have been extensively employed in| tracing sources of Pb and its transport pathways through the environment. However, Pb isotopic ratios in related geochemical reference materials are scarce. Here, we report high-precision Pb isotopic ratios measured by Nu Plasma Ⅱ MC-ICP-MS using calibrated 205Tl/203Tl=2.38865 (NIST SRM 997) for mass discrimination correction. The long-term external precision (2SD) for NIST SRM 981 of Pb, BCR-2, and BHVO-2 are 0.31‰ (n=105), 0.42‰ (n=11), and 0.25‰ (n=5) for 208pb/206pb and 0.16‰, 0.53‰, and 0.07‰ for 206Pb/207Pb, both respectively, and their Pb isotopic ratios are in excellent agreement with the recommended values. Using this method, we report for the first time Pb isotopic compositions in shale SGR-1b (USGS); coal CLB-1 (USGS); stream sediments GSD-17, -21, and -23 (IGGE); soils GSS-12, -13, -14, -15, and -16 (IGGE); plants GSV-1, -2, and -3 (IGGE); and human hair GSH-1(IGGE).