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首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >High-precision Ru isotopic measurements by multi-collector ICP-MS
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High-precision Ru isotopic measurements by multi-collector ICP-MS

机译：多收集器ICP-MS进行高精度Ru同位素测量

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摘要

Ruthenium isotopic data for a pure Aldrich ruthenium nitrate solution obtained using a Nu Plasma multi collector inductively coupled plasma-masss pectrometer(MC-ICP-MS) shows excellent agrement(better than 1 #epsilon# level (2#delta#).Higher sensitivity for MC ICP-MS cmpared to negative thermal ionization mass spectrometry (N-TIMS) is offset by the uncertainties introduced by relatively large mass discrimination and instabilities in the plasma source-ion extraction region that affect the long-term reproducibility.Large mass bias correction in ICP mass spectrometry demands particular attention to be paid to the choice of normalizing isotopes.Because of its position in the mass spectrum and the large mass bias correction,obtaining precise and accurate abundance data for ~(104)Ru by MC-ICP-MS remains difficult.Internal and external mass bias correction schemes in this mass range may show similar short comings if the isotope of interest does not lie within the mass range coerd by the masses used for normalization.Analyses of meteorite samples show that if isobaric interferences from Mo are sufficiently large (Ru/Mo<10~40,uncertainties on the Mo interference correction propagate through the mass bias correction and yield inaccurate results for Ru isotopic compositions.Second-order linear corrections may be used to correct for these inaccuracies,but such results are generally less precise than N-TIMS data.
机译：使用Nu等离子多收集器电感耦合等离子体质谱仪（MC-ICP-MS）获得的纯Aldrich硝酸钌溶液的钌同位素数据显示出极佳的一致性（低于1＃ε＃水平（2＃delta＃）。相对于负热电离质谱（N-TIMS）而言，MC ICP-MS的定量分析被相对较大的质量歧视和等离子体源-离子提取区域的不稳定性所带来的不确定性所抵消，这些不稳定性影响了长期可重复性。 ICP质谱中的质谱需要特别注意归一化同位素的选择。由于其在质谱中的位置和较大的质量偏差校正，因此通过MC-ICP-MS获得〜（104）Ru的精确准确的丰度数据如果感兴趣的同位素不在质量控制的质量范围内，则在此质量范围内的内部和外部质量偏差校正方案可能会显示类似的缺点。陨石样品的分析表明，如果Mo的等压干扰足够大（Ru / Mo <10〜40，则Mo干扰校正的不确定性会通过质量偏差校正传播，并且Ru同位素组成的结果不准确。阶线性校正可用于校正这些误差，但此类结果通常不如N-TIMS数据精确。

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