Application of addition HClO4 to improve the dissolution process and sensitivity of Os for low-concentration of Os in pyrite
Application of addition HClO4 to improve the dissolution process and sensitivity of Os for low-concentration of Os in pyrite
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DOI：
10.1016/j.microc.2019.104165
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发表时间：
2019-11
影响因子：
4.8
通讯作者：
Bingyu Gao;Wenjun Li;Xindi Jin;Lianchang Zhang
中科院分区：
文献类型：
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作者：
Bingyu Gao;Wenjun Li;Xindi Jin;Lianchang Zhang
铼（Re）和锇（Os）同位素体系一直被认为是直接测定成矿作用年龄和追踪金属来源的有效工具。一般情况下，在30-mL Carius管中用11 mL反王水溶解0.4 g黄铁矿。如果样品重量超过0.4 g，则需要更大体积的酸和更大的Carius管。在此，我们提出了一种改进的溶解过程中的Carius管消解方法，通过添加HClO4溶解较大的样品重量在较小体积的酸。该方法更适用于金属硫化物中低浓度锇的测定。详细地，将0.4g黄铁矿完全溶解在ImL HClO4和3mL反王水的混合物中。值得注意的是，在8 mL反王水中加入1 mL HClO4，样品量从0.4 g显著增加到0.8 g。实验结果表明，在不大于0.8g的样品中，加入1mL的HClO4不仅能显著提高反相王水的溶解能力，而且能避免Carius管爆炸。HClO_4-反王水法的溶解能力远高于H_2O_2-反王水法，是一种典型的Re-Os测年消解方法。该方法已通过标准物质（HLP和JDC）认证。简而言之，这种新方法允许在消耗更少酸的同时溶解更大量的样品。因此，该方法在金属硫化物中低浓度铼和锇的测定中更有潜力。
The rhenium (Re) and osmium (Os) isotope systems have long been recognized as effective tools to directly date mineralization and trace the source of metals. In general, 0.4 g of pyrite was dissolved by 11 mL of inverseaqua regiain a 30-mL Carius tube. Larger volumes of acids and a larger Carius tube were required if the sample weight was over 0.4 g. Herein we present an improved dissolution process of the Carius tube digestion method by adding HClO4to dissolve larger sample weights in smaller volumes of acid. This approach is more suitable for determining low concentrations of Os in metal sulfides. In detail, 0.4 g of pyrite was completely dissolved in a mixture of 1 mL of HClO4and 3 mL of inverseaqua regia. Notably, addition of 1 mL of HClO4to 8 mL of inverseaqua regiasignificantly increases the amount of sample from 0.4 to 0.8 g. Based on our data, while the sample weight was no >0.8 g, addition of 1 mL of HClO4to inverseaqua regiacan not only improve the dissolving capacity significantly, but also avoid Carius tube explosion. Furthermore, the dissolving capacity of HClO4-inverseaqua regiamethod is much higher than that of H2O2-inverseaqua regiamethod, which is a typical digestion method for Re-Os dating. This method was certified by reference materials (HLP and JDC). In brief, this new method allows dissolution of larger amounts of sample while consuming less acid. Therefore, this method has more potential for determining low concentrations of Re and Os in metal sulfides.