Simultaneous Determination of 143Nd/144Nd and 147Sm/144Nd Ratios and Sm鈥揘d Contents from the Same Filament Loaded with Purified Sm鈥揘d Aliquot from Geologica

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• 作者：Chao-Feng Li ; Xian-Hua Li ; Qiu-Li Li ; Jing-Hui Guo ; Xiang-Hui Li ; Lian-Jun Feng ; Zhu-Yin Chu
• 刊名：Analytical Chemistry
• 出版年：2012
• 出版时间：July 17, 2012
• 年：2012
• 卷：84
• 期：14
• 页码：6040-6047
• 全文大小：335K
• 年卷期：v.84,no.14(July 17, 2012)
• ISSN：1520-6882

文摘

Isotope dilution thermal ionization mass spectrometry (ID-TIMS) is the standard technique used to achieve precise ¹⁴³Nd/¹⁴⁴Nd and ¹⁴⁷Sm/¹⁴⁴Nd isotope ratios and accurate elemental concentrations of Sm鈥揘d. 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 ¹⁴³Nd/¹⁴⁴Nd and ¹⁴⁷Sm/¹⁴⁴Nd and concentrations of Sm鈥揘d 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 ¹⁵²Sm鈥?sup>148Nd 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 卤0.003% for the ¹⁴³Nd/¹⁴⁴Nd ratio and 卤1% for the ¹⁴⁷Sm/¹⁴⁴Nd ratio.