Measurement of 234U/238U and 230Th/232Th in volcanic rocks using the Neptune MC-ICP-MS

被引：51

作者：

Ball, Lary ^{[1
]}

Sims, Kennneth W. W. ^{[1
]}

Schwieters, Johannes ^{[2
]}

机构：

[1] Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA

[2] Thermo Fisher Sci, Bremen, Germany

来源：

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY | 2008年 / 23卷 / 02期

关键词：

D O I：

10.1039/b703193a

中图分类号：

O65 [分析化学];

学科分类号：

070302 [分析化学]; 081704 [应用化学];

摘要：

We present a new multicollector inductively coupled plasma mass spectrometric (MC-ICP-MS) method for measuring isotopic ratios of U-234/U-238 and Th-230/(232) Th in volcanic rocks using the Thermo Fisher Neptune. Uranium isotope measurements using SRM U010 as bracketing standard produce agreement within several permil for NBL 112A, REMP- 18, as well as for equilibrium rock standards. We also demonstrate that uranium standards are not appropriate for correcting thorium isotopic measurements due to di. erences between U and Th in both mass bias and mass- dependent ion transmission. Use of the thorium synthetic standard, UCSC ThA, as a bracketing standard produces data that agree well with 'accepted values' for other synthetic Th isotope standards and equilibrium rock standards.

引用

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页码：173 / 180

页数：8

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