The influence of the double spike proportion effect on stable isotope (Zn, Mo, Cd, and Sn) measurements by multicollector-inductively coupled plasma-mass spectrometry (MC-ICP-MS)†,Journal of Analytical Atomic Spectrometry

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The influence of the double spike proportion effect on stable isotope (Zn, Mo, Cd, and Sn) measurements by multicollector-inductively coupled plasma-mass spectrometry (MC-ICP-MS)†
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2018-02-14 00:00:00 , DOI: 10.1039/c8ja00016f
Le Zhang _{1,

2,

3,

4,

5} , Jie Li _{1,

2,

3,

4,

5} , Yi-Gang Xu _{1,

2,

3,

4,

5} , Zhong-Yuan Ren _{1,

2,

3,

4,

5}

Affiliation

This study investigates the double spike (DS) proportion effect on measurements of stable Zn, Mo, Cd, and Sn isotopes by multicollector-inductively coupled plasma-mass spectrometry (MC-ICP-MS). The effect of DS proportion values between 0.1 and 0.9 (i.e., 10–90% DS) on the compositions of measured references materials was determined. The δ^66/64Zn, δ^114/110Cd, and δ^120/118Sn values positively correlate with the proportion of the DS within a mixture, whereas δ^98/95Mo values negatively correlate with the proportion of DS. Stable Mo, Cd, and Sn isotopes have a range of DS values around the optimum where the resulting delta values are insensitive to DS proportion values and reflect the values of the reference materials with the optimum DS proportion values. However, Zn isotopes do not have a stable DS proportion range, indicating that δ^66/64Zn values are much more sensitive to DS proportion values than those of the other three elements. The measured δ^98/95Mo values of a mixture of the IAPSO seawater reference with variable amounts of DS solution also show a negative correlation with DS proportions. This indicates that although it is difficult to explain why DS proportion values have a significant influence on isotopic analyses, we suspect that the iterative calculations involved in the three algebraic equations used to resolve DS data generate correlations between delta and DS proportion values. This study highlights the importance of assessing DS proportion effects when establishing analytical protocols for stable isotope measurements using the DS technique. Any correlation between the resulting measured isotopic compositions and the associated DS proportion values means that DS solutions must be precisely added to unknown samples to ensure that appropriate proportions of DS are used.

中文翻译：

多重加标电感耦合等离子体质谱法（MC-ICP-MS）的双加标比例效应对稳定同位素（Zn，Mo，Cd和Sn）的测量值的影响†

这项研究调查了双尖峰（DS）比例效应对通过多集电极-电感耦合等离子体质谱（MC-ICP-MS）测量稳定的Zn，Mo，Cd和Sn同位素的影响。确定了DS比例值在0.1到0.9之间（即DS的10-90％）对所测参比物成分的影响。所述δ ^66/64锌，δ ^110分之114 Cd和δ^{一百一十八分之一百二}Sn的值与在混合物中的DS的比例正相关，而δ ^98/95Mo值与DS的比例负相关。稳定的Mo，Cd和Sn同位素的DS值范围接近最佳值，其中所得的delta值对DS比例值不敏感，并以最佳DS比例值反映参考材料的值。但是，Zn同位素的DS比例范围没有稳定，这表明^δ66/64 Zn值对DS比例值的敏感性比其他三个元素高。测得的^δ98/95IAPSO海水参考液与可变数量的DS溶液的混合物的Mo值也显示与DS比例呈负相关。这表明尽管很难解释为什么DS比例值对同位素分析具有重大影响，但我们怀疑用于解析DS数据的三个代数方程式所涉及的迭代计算会在增量和DS比例值之间产生相关性。这项研究强调了在建立使用DS技术进行稳定同位素测量的分析协议时，评估DS比例效应的重要性。所测得的同位素组成与相关的DS比例值之间的任何相关性意味着必须将DS溶液精确地添加到未知样品中，以确保使用适当比例的DS。

更新日期：2018-02-14

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