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