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Determination of the Isotopic Composition of an Enriched Hafnium Spike by MC‐ICP‐MS Using a Regression Model
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2020-05-29 , DOI: 10.1111/ggr.12343 Ran Lin 1, 2 , Jie Lin 1 , Keqing Zong 1, 2 , Kang Chen 1 , Shuoyun Tong 1 , Lanping Feng 1 , Wen Zhang 1 , Ming Li 1 , Yongsheng Liu 1, 2 , Zhaochu Hu 1 , Lian Zhou 1
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2020-05-29 , DOI: 10.1111/ggr.12343 Ran Lin 1, 2 , Jie Lin 1 , Keqing Zong 1, 2 , Kang Chen 1 , Shuoyun Tong 1 , Lanping Feng 1 , Wen Zhang 1 , Ming Li 1 , Yongsheng Liu 1, 2 , Zhaochu Hu 1 , Lian Zhou 1
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The isotope dilution (ID) method, owing to its high precision, is extensively used for the determination of element mass fractions in a wide range of natural samples. One of the prerequisites of the ID method is knowledge of the isotopic composition of an enriched spike, which is often challenging to accurately determine. In this study, we employ a regression mass bias correction model to accurately and precisely measure the isotopic composition of an enriched Hf spike (Lot No. 159293, Oak Ridge National Laboratory). A NIST SRM 3134 Re solution, whose isotopic composition was calibrated by an NRC IRIS‐1 Ir isotope standard, was used to calibrate the isotopic composition of the Hf spike. The obtained ratios of 176Hf/177Hf, 179Hf/177Hf and 180Hf/177Hf were 0.2406 ± 0.0005 (u, k = 1), 2.8620 ± 0.0005 (u, k = 1) and 384.65 ± 0.05 (u, k = 1), respectively, which meet the required precision levels for Hf isotopes in the application of the ID method. The combined uncertainties of the calibrated Re and Hf isotope ratios were evaluated using a Monte Carlo method, in which the uncertainty of the primary calibrator (IRIS‐1, 193Ir/191Ir = 1.6866 ± 0.0005, u, k = 1) was also taken into consideration. The precision of Hf spike was improved significantly compared with the SSB and C‐SSBIN methods. To the best of our knowledge, this is the first report of isotope ratio calibration in an enriched spike using the regression model. The precisely calibrated spike can lower the uncertainty of the Hf mass fraction significantly, thereby increasing the accuracy of the Lu‐Hf chronometer.
中文翻译：
使用回归模型通过MC-ICP-MS测定富Ha尖峰的同位素组成
同位素稀释（ID）方法由于其高精度而被广泛用于测定各种天然样品中的元素质量分数。ID方法的先决条件之一是了解加标峰的同位素组成，这通常很难准确确定。在这项研究中，我们采用回归质量偏差校正模型来精确地测量富集Hf峰的同位素组成（批次编号159293，橡树岭国家实验室）。NIST SRM 3134 Re溶液的同位素组成已通过NRC IRIS-1 Ir同位素标准校准，用于校准Hf峰的同位素组成。所获得的比率为176 Hf / 177 Hf，179 Hf / 177Hf和180 Hf / 177 Hf分别为0.2406±0.0005（u，k = 1），2.8620±0.0005（u，k = 1）和384.65±0.05（u，k = 1），满足以下要求的精度水平f同位素在ID法中的应用。使用蒙特卡罗方法，所述校准的重和Hf同位素比率的组合不确定度进行评价，其中主校准器的不确定性（IRIS-1，193的Ir / 191 IR = 1.6866±0.0005，ū，ķ = 1）也被考虑在内。与SSB和C-SSBIN方法相比，Hf尖峰的精度得到了显着提高。据我们所知，这是首次使用回归模型对富集峰中的同位素比率进行校准的报告。精确校准的尖峰可以显着降低Hf质量分数的不确定性，从而提高Lu-Hf天文钟的精度。
更新日期：2020-05-29
中文翻译：
使用回归模型通过MC-ICP-MS测定富Ha尖峰的同位素组成
同位素稀释（ID）方法由于其高精度而被广泛用于测定各种天然样品中的元素质量分数。ID方法的先决条件之一是了解加标峰的同位素组成，这通常很难准确确定。在这项研究中，我们采用回归质量偏差校正模型来精确地测量富集Hf峰的同位素组成（批次编号159293，橡树岭国家实验室）。NIST SRM 3134 Re溶液的同位素组成已通过NRC IRIS-1 Ir同位素标准校准，用于校准Hf峰的同位素组成。所获得的比率为176 Hf / 177 Hf，179 Hf / 177Hf和180 Hf / 177 Hf分别为0.2406±0.0005（u，k = 1），2.8620±0.0005（u，k = 1）和384.65±0.05（u，k = 1），满足以下要求的精度水平f同位素在ID法中的应用。使用蒙特卡罗方法，所述校准的重和Hf同位素比率的组合不确定度进行评价，其中主校准器的不确定性（IRIS-1，193的Ir / 191 IR = 1.6866±0.0005，ū，ķ = 1）也被考虑在内。与SSB和C-SSBIN方法相比，Hf尖峰的精度得到了显着提高。据我们所知，这是首次使用回归模型对富集峰中的同位素比率进行校准的报告。精确校准的尖峰可以显着降低Hf质量分数的不确定性，从而提高Lu-Hf天文钟的精度。
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