Carius管直接蒸馏快速分离锇方法研究
Rapid Separation of Osmium by Direct Distillation with Carius Tube
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摘要: 建立了Carius管直接蒸馏快速分离锇的方法。采用一次性的常规硅胶管和细聚四氟乙烯管来封闭Carius管及作为通气管，将常规的把样品溶液转入蒸馏瓶中进行蒸馏的方法改进为从Carius管内直接蒸馏分离锇，简化了实验流程，缩短了锇的分离时间，同时节省了大量清洗蒸馏器皿的时间及清洗试剂。用电感耦合等离子体质谱法测定铼-锇同位素的模式年龄，结果表明，通气流量为30～80 mL/min时，蒸馏30 min，对铼-锇定年标准物质GBW 04435（HLP）的7次测定平均值为（221.3±0.4） Ma，标准物质GBW 04436（JDC）的2次测定平均值为（139.7±0.2）Ma，分别与模式年龄的标准值（221.4±5.6） Ma、（139.6±3.8）Ma在不确定度范围内一致。方法具有批量分析样品铼-锇同位素的应用前景。
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关键词:
- 铼-锇同位素；Carius管；直接蒸馏 /
- 电感耦合等离子体质谱法
Abstract: A method for rapid separation of Os by direct distillation with Carius tube is described in this paper. Using Carius tube to replace the traditional distilling flask has remarkably improved the separation efficiency of Os and saving the reagents. The parameter of Carius tube distillation was optimized and gas flow rate of 30～80 mL/min and 30 min distillation time were selected. The method has been applied to ReOs dating by inductively coupled plasmamass spectrometry (ICPMS). The dating results obtained from molybdenite reference materials GBW 04435（HLP） and GBW 04436 （JDC） are (221.3±0.4) Ma (n=7) and (139.7±0.2) Ma (n=2) respectively, in good agreement with certified values of (221.4±5.6) Ma for GBW 04435 and (139.6±3.8) Ma for GBW 04436. The method has a good application prospects in the conventional ReOs isotope analysis. -
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