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

Chemical Geology

By:
,
DOI: 10.1016/S0009-2541(00)00189-3

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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. (C) 2000 Elsevier Science B.V. All rights reserved.

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
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Chemical Geology
First page:
123
Last page:
134
Number of Pages:
12