Simultaneous determination of 143Nd/144Nd and 147Sm/144Nd ratios and Sm-Nd contents from the same filament loaded with purified Sm-Nd aliquot from geological samples by isotope dilution thermal ionization mass spectrometry.
Simultaneous determination of 143Nd/144Nd and 147Sm/144Nd ratios and Sm-Nd contents from the same filament loaded with purified Sm-Nd aliquot from geological samples by isotope dilution thermal ionization mass spectrometry.
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DOI：
10.1021/ac300786x
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发表时间：
2012-06
影响因子：
7.4
通讯作者：
Chaofeng Li;Xian‐Hua Li;Qiu-li Li;Jing-hui Guo;Xianghui Li;Lianjun Feng;Zhuyin Chu
中科院分区：
文献类型：
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作者：
Chaofeng Li;Xian‐Hua Li;Qiu-li Li;Jing-hui Guo;Xianghui Li;Lianjun Feng;Zhuyin Chu
同位素稀释热电离质谱（ID-TIMS）是标准技术，用于实现精确的（143）Nd/(144)Nd和（147）Sm/(144)Nd同位素比率和精确的Sm-Nd元素浓度。然而，在以前的研究中，由于严重的等压干扰，纯化的Sm和Nd馏分必须单独加载到不同的细丝上才能使用TIMS准确测定。因此，传统的ID-TIMS技术既耗时又费力。在本研究中，提出了一种新的方法，可以同时获得（143）Nd/(144)Nd和（147）Sm/(144)Nd的比率和Sm-Nd的浓度在相同的灯丝排列。采用目前的方法，测量时间和灯丝消耗减少了50%，因此，大大降低了TIMS的运行成本。采用混合（152）Sm-(148)Nd尖峰进行尖峰减法和等压干涉校正后，得到了准确的结果。从一系列标准岩样中获得的结果与推荐值吻合良好，（143）Nd/(144)Nd比在±0.003%以内，（147）Sm/(144)Nd比在±1%以内。
Isotope dilution thermal ionization mass spectrometry (ID-TIMS) is the standard technique used to achieve precise (143)Nd/(144)Nd and (147)Sm/(144)Nd isotope ratios and accurate elemental concentrations of Sm-Nd. However, in previous studies, purified Sm and Nd fractions must be individually loaded onto different filaments for their accurate determination using TIMS because of severe isobaric interferences. Thus, the classical ID-TIMS technique is time consuming and laborious. In this study, a new method is proposed, which is able to acquire both ratios of (143)Nd/(144)Nd and (147)Sm/(144)Nd and concentrations of Sm-Nd simultaneously on the same filament arrangement. The measurement time and filament consumption are reduced by 50% with the current method, and therefore, the operation cost of TIMS is significantly reduced. A mixed (152)Sm-(148)Nd spike was employed to achieve accurate results after spike subtraction and isobaric interference corrections. Results obtained from a series of standard rock samples are in good agreement with recommended values, within ±0.003% for the (143)Nd/(144)Nd ratio and ±1% for the (147)Sm/(144)Nd ratio.