The Implications of HClO<sub>4</sub> for Dissolving Large Masses of Low Level Os in Metal Sulfides and Factors that Influence Re-Os Dating
In general, no more than 1 g of metal sulfide can be completely digested in 20 mL of inverse aqua regia using the Carius tube technique. In this study, the sample weight increased after adding HClO<sub>4</sub> to inverse aqua regia while the volume of acid concurrently decreased signific...
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MDPI AG
2020-09-01
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| Online Access: | https://www.mdpi.com/2076-3417/10/18/6218 |
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| author | Bingyu Gao Wenjun Li Lianchang Zhang Jun Gao |
| author_facet | Bingyu Gao Wenjun Li Lianchang Zhang Jun Gao |
| author_sort | Bingyu Gao |
| collection | DOAJ |
| description | In general, no more than 1 g of metal sulfide can be completely digested in 20 mL of inverse aqua regia using the Carius tube technique. In this study, the sample weight increased after adding HClO<sub>4</sub> to inverse aqua regia while the volume of acid concurrently decreased significantly. Three grams of metal sulfide were digested in 12 mL of acid (3 mL of HClO<sub>4</sub> and 9 mL of inverse aqua regia) via the HClO<sub>4</sub>-inverse aqua regia method. The results using molybdenite reference materials JDC and HLP mixed with 3 g of pyrite were consistent with certified values. Compared to the traditional method, the HClO<sub>4</sub>-inverse aqua regia method could dissolve a larger sample mass (3 g) with a smaller volume of acids (12 mL). We simultaneously found that the oxidation of digestion acids greatly affected the Os signal but had no influence on the equilibrium of isotope exchange between <sup>185</sup>Re and <sup>190</sup>Os spikes in Re and Os samples. Remarkably, the heating temperature was the most significant factor influencing the equilibrium of isotope exchange, and the Os in a sample was not equilibrated with the spike until the heating temperature reached 190 °C. |
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| language | English |
| last_indexed | 2024-03-10T16:30:13Z |
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| spelling | doaj.art-f1c959ef2d30499b8aa507f61a23205d2023-11-20T12:55:28ZengMDPI AGApplied Sciences2076-34172020-09-011018621810.3390/app10186218The Implications of HClO<sub>4</sub> for Dissolving Large Masses of Low Level Os in Metal Sulfides and Factors that Influence Re-Os DatingBingyu Gao0Wenjun Li1Lianchang Zhang2Jun Gao3Key laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaKey laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaKey laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaKey laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaIn general, no more than 1 g of metal sulfide can be completely digested in 20 mL of inverse aqua regia using the Carius tube technique. In this study, the sample weight increased after adding HClO<sub>4</sub> to inverse aqua regia while the volume of acid concurrently decreased significantly. Three grams of metal sulfide were digested in 12 mL of acid (3 mL of HClO<sub>4</sub> and 9 mL of inverse aqua regia) via the HClO<sub>4</sub>-inverse aqua regia method. The results using molybdenite reference materials JDC and HLP mixed with 3 g of pyrite were consistent with certified values. Compared to the traditional method, the HClO<sub>4</sub>-inverse aqua regia method could dissolve a larger sample mass (3 g) with a smaller volume of acids (12 mL). We simultaneously found that the oxidation of digestion acids greatly affected the Os signal but had no influence on the equilibrium of isotope exchange between <sup>185</sup>Re and <sup>190</sup>Os spikes in Re and Os samples. Remarkably, the heating temperature was the most significant factor influencing the equilibrium of isotope exchange, and the Os in a sample was not equilibrated with the spike until the heating temperature reached 190 °C.https://www.mdpi.com/2076-3417/10/18/6218Re-Os isotopelow concentration Os in metal sulfideperchloric acidequilibrium of isotope exchangeacid oxidation |
| spellingShingle | Bingyu Gao Wenjun Li Lianchang Zhang Jun Gao The Implications of HClO<sub>4</sub> for Dissolving Large Masses of Low Level Os in Metal Sulfides and Factors that Influence Re-Os Dating Applied Sciences Re-Os isotope low concentration Os in metal sulfide perchloric acid equilibrium of isotope exchange acid oxidation |
| title | The Implications of HClO<sub>4</sub> for Dissolving Large Masses of Low Level Os in Metal Sulfides and Factors that Influence Re-Os Dating |
| title_full | The Implications of HClO<sub>4</sub> for Dissolving Large Masses of Low Level Os in Metal Sulfides and Factors that Influence Re-Os Dating |
| title_fullStr | The Implications of HClO<sub>4</sub> for Dissolving Large Masses of Low Level Os in Metal Sulfides and Factors that Influence Re-Os Dating |
| title_full_unstemmed | The Implications of HClO<sub>4</sub> for Dissolving Large Masses of Low Level Os in Metal Sulfides and Factors that Influence Re-Os Dating |
| title_short | The Implications of HClO<sub>4</sub> for Dissolving Large Masses of Low Level Os in Metal Sulfides and Factors that Influence Re-Os Dating |
| title_sort | implications of hclo sub 4 sub for dissolving large masses of low level os in metal sulfides and factors that influence re os dating |
| topic | Re-Os isotope low concentration Os in metal sulfide perchloric acid equilibrium of isotope exchange acid oxidation |
| url | https://www.mdpi.com/2076-3417/10/18/6218 |
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