期刊
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
卷 33, 期 2, 页码 195-204出版社
WILEY
DOI: 10.1111/j.1751-908X.2009.00017.x
关键词
matrix effect; mass bias; standard solution bracketing; rhenium isotopes; tungsten isotopes; MC-ICP-MS; effet matrice; fractionnement de masse instrumental; encadrement de mesures d'Etalon; isotopes du rhEnium; isotopes du tungstene; MC-ICP-MS
资金
- Le Fonds Quebecois de Recherche sur la Nature et les Technologies (FQRNT) [GEOTOP-2009-0001]
The geochemistry of Re-Os and the recent use of Re as a non-traditional stable isotope both need accurate and precise quantification of Re-187/Re-185 ratios. This paper reports rhenium isotopic data obtained from the analysis of a standard solution and geological samples by MC-ICP-MS. We show that measured isotopic ratios are modified by matrix effects that cannot be accounted for by the standard solution bracketing technique. The bias resulting from measurements on a spiked (Re-185-enriched) sample is shown to alter the apparent Re concentration by several percent. When spiking samples and calibrators with tungsten, simultaneous measurement of tungsten and rhenium isotopes compensates for the matrix-induced modification of mass bias. Rhenium and tungsten are shown to have different fractionation factors. This may be due to the fact that the two elements fractionate in a different but systematic way, or that the reference isotopic ratios used for elemental Re and W are incoherent with one another. The consistency of fractionation through time can be used to obtain an empirical relationship between W and Re measured ratios from a standard solution to obtain a sample's fractionation-corrected Re-187/Re-185 spiked ratio on samples containing pg g(-1) levels of Re, even if some matrix capable of affecting mass bias remains in the final solution.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据