Ion exchange separation of chromium from natural water matrix for stable isotope mass spectrometric analysis

Chemical Geology
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Abstract

A method has been developed for separating the Cr dissolved in natural water from matrix elements and determination of its stable isotope ratios using solid-source thermal-ionization mass spectrometry (TIMS). The separation method takes advantage of the existence of the oxidized form of Cr as an oxyanion to separate it from interfering cations using anion-exchange chromatography, and of the reduced form of Cr as a positively charged ion to separate it from interfering anions such as sulfate. Subsequent processing of the separated sample eliminates residual organic material for application to a solid source filament. Ratios for 53Cr/52Cr for National Institute of Standards and Technology Standard Reference Material 979 can be measured using the silica gel-boric acid technique with a filament-to-filament standard deviation in the mean 53Cr/52Cr ratio for 50 replicates of 0.00005 or less. 

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Ion exchange separation of chromium from natural water matrix for stable isotope mass spectrometric analysis
Series title Chemical Geology
DOI 10.1016/S0009-2541(00)00189-3
Volume 168
Issue 1-2
Year Published 2000
Language English
Publisher Elsevier
Contributing office(s) Toxic Substances Hydrology Program
Description 12 p.
First page 123
Last page 134