Fe isotope variations in natural materials measured using high mass resolution multiple collector ICPMS

被引:169
作者
Arnold, GL [1 ]
Weyer, S
Anbar, AD
机构
[1] Univ Rochester, Dept Earth & Environm Sci, Rochester, NY 14627 USA
[2] ThermoFinnigan GmbH, Bremen, Germany
[3] Univ Rochester, Dept Chem, Rochester, NY 14627 USA
关键词
D O I
10.1021/ac034601v
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
We present the first measurements of Fe isotope variations in chemically purified natural samples using high mass resolution multiple-collector inductively coupled plasma source mass spectrometry (MC-ICPMS). High mass resolution allows polyatomic interferences at Fe masses to be resolved (especially, (ArN+)-Ar-40-N-14, (ArO+)-Ar-40-O-16, and (ArOH+)-Ar-40-O-16). Simultaneous detection of Fe isotope ion beams using multiple Faraday collectors facilitates high-precision isotope ratio measurements. Fe in basalt and paleosol samples was extracted and purified using a simple, single-stage anion chemistry procedure. A Cu "element spike" was used as an internal standard to correct for variations in mass bias. Using this procedure, we obtained data with an external precision of 0.03-0.11parts per thousand and 0.04-0.15parts per thousand for delta(56/54)Fe and delta(57/54)Fe, respectively (2sigma). Use of Cu was necessary for such reproducibility, presumably because of subtle effects of residual sample matrix on mass bias. These findings demonstrate the utility of high-resolution MC-ICPMS for high-precision Fe isotope analysis in geologic and other natural materials. They also highlight the importance of internal monitoring of mass bias, particularly when using routine methods for Fe extraction and purification.
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收藏
页码:322 / 327
页数:6
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