Browsing by Author "Xiang, P."
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Item A contribution to common Carius tube distillation techniques(Journal of Analytical Atomic Spectrometry, 2013-02) Jin, X.; Li, W.; Xiang, P.; Sakyi, P.A.; Zhu, M.; Zhang, L.In this paper, we introduce an economic electrothermal timing steamer for common Carius tube Os in situ distillation. It is suitable for analysing several batches of samples. Its configuration allows the Carius tubes to be properly fixed and bathed in steam into which the tubes are immersed. The top of each Carius tube is sealed with a stretchy rubber head through which a pair of teflon tubes pierce, serving as inlet and outlet for clean air and OsO4 respectively. At steam temperatures of 99-100 °C, OsO4 in the sample solutions inside the Carius tubes is evaporated out and subsequently carried by clean air to the trapping water in an ampoule bottle, immersed in a box filled with ice. In the present study the steamer allowed for the convenient, efficient and simultaneous distillation of Os from seven samples with near ninety percent recovery. The blank values were 0.42 ± 0.15 pg and 0.26 ± 0.05 for 187Os and 187Os/ 188Os (n = 4). The dating results of reference materials (RMs) namely Henderson, HLP and JDC were in accordance with reference and certified values within the range of uncertainties. The special steamer has successfully been used in the analysis of pyrite samples for the distillation of Os. © 2013 The Royal Society of Chemistry.Item A new modification of the sample introduction system for Os isotope ratio measurements(Journal of Analytical Atomic Spectrometry, 2011-06) Jin, X.; Du, A.; Li, W.; Xiang, P.; Sakyi, P.A.; Zhang, L.Here we present a new modification of the sample introduction system aimed at precisely measuring Os isotope ratios. A small glass connector was used to transfer OsO4 vapor from a Carius tube into a nebulizer. After dissolution of sample in a Carius tube, Os isotopes in the sample were determined simultaneously through in situ distillation without any prior separation procedure. The analytical precision at intermediate precision conditions of measurement was improved through the simultaneous introduction of Os via sparging and the aspiration of a solution containing Ir for mass bias correction. The present method, which involves the passage of Os vapor directly into the ICP-MS torch, thus solves the problems encountered previously when optimizing an instrument. The dating results of reference materials (RMs) HLP and JDC by the modified method are 221.8 ± 0.70 Ma (0.31%, 2s, n = 7) and 140.0 ± 0.44 Ma (0.31%, 2s, n = 9) respectively, which are consistent with their certified values of 221.4 ± 5.6 Ma and 139.6 ± 3.8 Ma respectively. Also reported in this study are dating results of several unknown molybdenite samples by the new method. © 2011 The Royal Society of Chemistry.