A simple method for obtaining highly accurate Pb isotope data by MC-ICP-MS
A simple method for obtaining highly accurate Pb isotope data by MC-ICP-MS
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DOI：
10.1039/b205045e
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发表时间：
2002-09
影响因子：
3.4
通讯作者：
J. Woodhead
中科院分区：
文献类型：
--
作者：
J. Woodhead
多收集器电感耦合等离子体质谱(MC-ICPMS)最近在同位素比值测定方面的许多研究突出了这一新兴技术所能达到的良好的分析精度水平。不幸的是，要获得MC-ICP-MS的高精度分析往往是一件困难得多的事情。尤其是对于不可能对仪器质量偏差效应进行内部归一化的同位素系统，例如，铅、铜、锌、硼、锂。鉴于现在双峰热电离质谱(TIMS)可以获得极其准确的铅同位素数据，这似乎是广泛采用MC-ICPMS方法分析铅的主要障碍。然而，这一贡献表明，对现有方案进行一些简单的修改，就可以产生与最佳双峰TIMS结果相当的精度的MC-ICPMS铅同位素数据。这种方法还保留了电感耦合等离子体质谱分析的许多固有优势，如快速样品处理，并避免了许多严格的双加标分析要求。该方法是高度可靠的，总结了我们实验室过去两年的结果，并提出了进一步发展的建议。
Many recent studies of isotope ratio determination by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) have highlighted the excellent levels of analytical precision obtainable using this newly emergent technology. Unfortunately, it is often a considerably more difficult matter to obtain highly accurate analyses by MC-ICP-MS. This is particularly the case for isotope systems in which internal normalisation for instrumental mass bias effects is not possible, e.g., Pb, Cu, Zn, B, Li. Given the fact that extremely accurate Pb isotope data can now be obtained by double-spike thermal ionisation mass spectrometry (TIMS), this is seemingly a major impediment to the widespread adoption of MC-ICP-MS methods for the analysis of Pb. It is demonstrated in this contribution, however, that a few simple modifications to existing protocols can produce MC-ICP-MS Pb isotope data of comparable accuracy to the best double spike TIMS results. This method also preserves many of the inherent advantages of ICP-MS analysis, such as rapid sample processing, and avoids many of the stringent analytical requirements of double spiking. The method is highly reliable and a summary of results from our laboratory over the past two years is presented, together with suggestions for further development.