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Measurements of rhenium isotopic composition in low-abundance samples

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Abstract

Rhenium (Re) is a trace element whose redox chemistry makes it an ideal candidate to trace a range of geochemical processes. In particular, fractionation of its isotopes 187Re (62.6% abundance) and 185Re (37.4%) may be used to improve our understanding of redox reactions during weathering, both in the modern day and in geological archives. Published methods for measurement of Re isotopic composition are limited by the requirements of Re mass to reach a desirable precision, making the analysis of many geological materials unfeasible at present. Here we develop new methods which allow us to measure Re isotope ratios (reported as δ187Re) with improved precision: ±0.10‰ (2σ) for a mass of Re of ∼1 ng to ±0.03‰ (2σ) for a mass of Re of >10 ng. This is possible due to the combination of a modified column chemistry procedure and the use of 1013 Ω amplifiers for measurement via multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS). For river water samples (with Re concentrations typically ∼10−12 g g−1) we design a field-based pre-concentration of Re that can be used with large volumes of filtered water (5–20 L) shortly after sample collection to provide abundant Re for isotope analysis. As a result of these developments we provide new measurements of δ187Re in standards reference materials (δ187Re values range from −0.06 ± 0.07‰ to +0.19 ± 0.05‰) and a seawater standard (δ187Re = +0.10 ± 0.04‰), providing impetus for further exploration of the Re isotope system.

Graphical abstract: Measurements of rhenium isotopic composition in low-abundance samples

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Supplementary files

Article information


Submitted
20 Aug 2019
Accepted
27 Nov 2019
First published
07 Jan 2020

This article is Open Access

J. Anal. At. Spectrom., 2020, Advance Article
Article type
Paper

Measurements of rhenium isotopic composition in low-abundance samples

M. Dellinger, R. G. Hilton and G. M. Nowell, J. Anal. At. Spectrom., 2020, Advance Article , DOI: 10.1039/C9JA00288J

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