Neodymium isotope ratio measurements by CE-MC-ICPMS: investigation of isotopic fractionation and evaluation of analytical performances,Journal of Analytical Atomic Spectrometry

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Neodymium isotope ratio measurements by CE-MC-ICPMS: investigation of isotopic fractionation and evaluation of analytical performances
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2017-09-27 00:00:00 , DOI: 10.1039/c7ja00250e
Benoît Martelat _{1,

2,

3,

4,

5} , Laurent Vio _{1,

2,

3,

4,

5} , Hélène Isnard _{1,

2,

3,

4,

5} , Jérôme Simonnet _{1,

2,

3,

4,

5} , Térence Cornet _{1,

2,

3,

4,

5} , Anthony Nonell _{1,

2,

3,

4,

5} , Frédéric Chartier _{2,

3,

4,

5,

6}

Affiliation

Precise isotope ratio measurements in the nuclear field often require hyphenation of separation techniques with multicollector inductively coupled plasma mass spectrometry (MC-ICPMS). Among these separation techniques, electrokinetic methods are very interesting as they use the lowest sample volumes and produce the least amount of radioactive waste. The objectives of this study were to evaluate the performances when coupling electrokinetic techniques with MC-ICPMS for measuring isotope ratios of Nd, an element of interest for nuclear purposes. During data acquisition along the elution peak, an isotope ratio drift was observed and studied. In order to discriminate the drift induced by the MC-ICPMS detectors, the raw data of the isotope signals were corrected by taking into account the difference of time response of the Faraday cup amplifiers. An isotopic mass-dependent fractionation induced by the electrokinetic separation was then highlighted. Some of the parameters were modified (i.e., the length of the capillary and the external pressure) to evaluate their impact on the amplitude of fractionation. Finally, the measurement performances were evaluated for all the isotope ratios. The reproducibility obtained was lower than 0.2‰ regardless of the considered Nd isotope ratio with only 0.5 ng of injected Nd.

中文翻译：

CE-MC-ICPMS测量钕同位素比：同位素分馏研究和分析性能评估

核场中精确的同位素比测量通常需要使用多收集器电感耦合等离子体质谱法（MC-ICPMS）来对分离技术进行断字连接。在这些分离技术中，电动方法非常有趣，因为它们使用的样品量最少，产生的放射性废物最少。这项研究的目的是评估将电动技术与MC-ICPMS耦合以测量Nd的同位素比（用于核目的的重要元素）时的性能。在沿洗脱峰的数据采集过程中，观察到并研究了同位素比率漂移。为了区分由MC-ICPMS检测器引起的漂移，通过考虑法拉第杯放大器的时间响应差异来校正同位素信号的原始数据。然后强调了由电动分离引起的同位素质量依赖性分级分离。一些参数已修改（即毛细管的长度和外部压力）以评估它们对分馏幅度的影响。最后，对所有同位素比率的测量性能进行了评估。无论所考虑的Nd同位素比是多少（仅注入0.5 ng的Nd），所获得的重现性均低于0.2‰。

更新日期：2017-11-02

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