Determination of Hf–Sr–Nd isotopic ratios by MC-ICP-MS using rapid acid digestion after flux-free fusion in geological materials
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In this study, we established a rapid acid digestion for determining Hf–Sr–Nd isotopic ratios of geological samples by using MC-ICP-MS. Conditions of 1600 °C for 1 min and 1400 °C for 1 min were adopted for fusing intrusive rocks and extrusive rocks, respectively. The rapid acid digestion technique is superior in digestion time compared with high-pressure PTFE bomb method. The procedural blanks of the method were also lower than that flux fusion. Replicate analyses of international certified reference materials (CRMs) indicate that isotopic ratios of 176Hf/177Hf, 87Sr/86Sr and 143Nd/144Nd agree well with previously published data. The external reproducibility (2SD, n = 5) of ten CRMs are ±0.000030 for 87Sr/86Sr, ±0.000030 for 143Nd/144Nd, and ±0.000018 for 176Hf/177Hf.
KeywordsCertified reference material Flux-free fusion Hf–Sr–Nd isotopic ratio Procedural blank Rapid acid digestion
We would like to thank the editors and anonymous reviewers who helped to improve this manuscript. This study was supported by the National Natural Science Foundation of China (Grant Nos. 41421002, 41427804, and 41373004) and the MOST Research Foundation from the State Key Laboratory of Continental Dynamics (Grant Nos. BJ08132-1, 207010021, and 201210004).
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