Isotope Dilution Determinations of Lu, Hf, Zr, Ta and W, and Hf Isotope Compositions of NIST SRM 610 and 612 Glass Wafers

Geostandards and Geoanalytical Research - Tập 33 Số 4 - Trang 487-499 - 2009
Oliver Nebel1, M.L.A. Morel1, Pieter Z. Vroon1
1Faculty of Earth and Life Sciences, VU University, Amsterdam, The Netherlands

Tóm tắt

Isotope dilution determinations of Lu, Hf, Zr, Ta and W are reported for nine test portions (five for W) of NIST SRM 610 and 612 glass wafers. Additionally, all test portions were analysed for their Hf isotope compositions. In general, high field strength elemental (HFSE) distributions in NIST SRM 610 and 612 were reproducible to ∼± 1%, except for Zr (± 5%) in NIST SRM 612, and absolute reported concentrations agreed with previously published values, but with higher precision. The slightly worse reproducibility of Zr in NIST SRM 612 compared to other HFSE is interpreted to result from analytical scatter, rather than sample inhomogeneity. The analyses demonstrated elemental homogeneity for both glass wafers for samples of 1–2 mg with respect to the precision of the method, i.e., ± 1% or better. Average Hf isotope compositions for both glass wafers agreed within uncertainty and the weighted average of all determinations yielded a mean 176Hf/177Hf ratio of 0.282111 ± 0.000009 (95% confidence level). However, although mean values for NIST SRM 610 and 612 agreed within analytical limits, NIST SRM 610 test portions showed a tendency of systematically elevated isotope composition of ∼ 0.5 ɛHf units when compared to NIST SRM 612, which may indicate a slightly more radiogenic Hf isotope composition of NIST SRM 610. The results of this study suggest that NIST SRM 610 and 612 are valuable calibrators for HFSE in situ analyses within the given uncertainties.

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Tài liệu tham khảo

10.1016/S0012-821X(97)00040-X

10.1007/s004100050278

10.1016/0016-7037(95)00431-9

10.1016/j.chemgeo.2006.05.007

10.1111/j.1751-908X.2002.tb00634.x

10.6028/jres.077A.040

10.1086/177523

10.1111/j.1751-908X.2008.00889.x

10.1016/j.chemgeo.2005.03.010

10.1111/j.1751-908X.2006.tb01064.x

10.1111/j.1751-908X.1998.tb00542.x

10.1111/j.1751-908X.1998.tb00541.x

10.1111/j.1751-908X.2004.tb00760.x

10.1016/j.epsl.2008.07.002

10.1016/0168-1176(95)04201-U

10.1016/0016-7037(82)90159-4

10.1016/j.chemgeo.2008.06.040

10.1029/2001GC000183

10.1016/j.chemgeo.2005.03.009

10.1016/j.chemgeo.2006.03.003

10.1016/j.ijms.2005.08.003

10.1111/j.1751-908X.1997.tb00538.x

10.1016/j.epsl.2006.11.027

Phipps C., 2006, Laser ablation and its applications. Springer series in optical sciences, 588

10.1111/j.1751-908X.2002.tb00882.x

10.1111/j.1751-908X.2000.tb00778.x

10.1111/j.1751-908X.1997.tb00537.x

10.1016/0016-7037(78)90105-9

10.1016/j.ijms.2004.04.006

Sylvester P., 2001, Laser‐ablation‐ICP‐MS in the Earth sciences: Principles and applications, 243

10.1016/S0012-821X(00)00004-2

10.1029/2004GC000721

10.1016/0168-1176(91)80070-4

10.1029/2006GC001473

10.1016/S0009-2541(02)00129-8

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Geostandards and Geoanalytical Research

Tập 33 Số 4

487-499

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