Use of Zr for mass bias correction in strontium isotope ratio determinations using MC-ICP-MS

被引：0
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作者：
Yang, Lu [1 ]
Peter, Charlotte [2 ]
Panne, Ulrich [2 ]
Sturgeon, Ralph E. [1 ]
机构：
[1] Institute for National Measurement Standards, National Research Council Canada, Ottawa, ON K1A 0R6, Canada
[2] Federal Institute for Materials Research and Testing, Berlin, Germany
来源：
Journal of Analytical Atomic Spectrometry | 2008年 / 23卷 / 09期
关键词：
Isotope abundance ratios and isotopic composition of strontium in a biological sample were determined using MC-ICP-MS whereby zirconium was admixed with solutions of digested NIST SRM 987 and samples and used for mass bias correction with implementation of a combination of standard-sample-standard bracketing and internal normalization. In this manner; the certified value of 8.37861 for 88Sr/86Sr in SRM 987 was used for mass bias correction of 90Zr/91Zr in two adjacent spiked solutions of SRM 987. Their average was then used to calculate mass bias corrected Sr isotope ratios in the sample. An approximate 2.5-fold improvement in precision of determination of 87Sr/86Sr and 88Sr/ 86Sr was obtained compared to that based on only the standard-sample-standard bracketing technique; although close matching of Sr and Zr concentrations is required in the standard and sample. Absolute isotope ratios of 0.0564240 ± 0.0000042; 0.709362 ± 0.000013 and 8.38034 ± 0.00010 (1SD) and δx/86Sr-values of -2.228 ± 0.075; -1.377; ±; 0.018; and; 0.207; 0.012; (1SD); for; 84Sr/86Sr; 87Sr/86Sr; 88Sr/86Sr relative to SRM 987; respectively; were obtained characterizing a fish liver sample. In agreement with previous studies; evidence is presented for variation of 88Sr/86Sr in samples. Estimation of the measurement uncertainty confirmed that the major source of imprecision arises from the uncertainty in the certified value of 88Sr/86Sr in SRM 987 used for mass bias correction. © 2008 The Royal Society of Chemistry;
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页码：1269 / 1274
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