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Title: Selenium isotope ratios as indicators of selenium sources and oxyanion reduction

Abstract

Selenium stable isotope ratio measurements should serve as indicators of sources and biogeochemical transformations of Se. The authors report measurements of Se isotope fractionation during selenate reduction, selenite sorption, oxidation of reduced Se in soils, and Se volatilization by algae and soil samples. These results, combined with previous work with Se isotopes, indicate that reduction of soluble oxyanions is the dominant cause of Se isotope fractionation. Accordingly, Se isotope ratios should be useful as indicators of oxyanion reduction, which can transform mobile species to forms that are less mobile and less bioavailable. Additional investigations of Se isotope fractionation are needed to confirm this preliminary assessment. The authors have developed a new method for measurement of natural Se isotope ratio variation which requires less than 500 ng Se per analysis and yields {+-}0.2% precision on {sup 80}Se/{sup 76}Se. A double isotope spike technique corrects for isotopic fractionation during sample preparation and mass spectrometry. The small minimum sample size is important, as Se concentrations are often below 1 ppm in solids and 1 {micro}g/L in fluids. The Se purification process is rapid and compatible with various sample matrices, including acidic rock or sediment digests.

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Illinois, Urbana, IL (US)
Sponsoring Org.:
National Science Foundation (NSF); USDOE
OSTI Identifier:
20000935
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Geochimica et Cosmochimica Acta
Additional Journal Information:
Journal Volume: 63; Journal Issue: 18; Other Information: PBD: Sep 1999; Journal ID: ISSN 0016-7037
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; SELENIUM ISOTOPES; ISOTOPE RATIO; SOIL CHEMISTRY; SELENIUM; REDUCTION; SORPTION; OXIDATION; EVAPORATION; BIODEGRADATION

Citation Formats

Johnson, T.M., Herbel, M.J., Bullen, T.D., and Zawislanski, P.T. Selenium isotope ratios as indicators of selenium sources and oxyanion reduction. United States: N. p., 1999. Web. doi:10.1016/S0016-7037(99)00279-3.
Johnson, T.M., Herbel, M.J., Bullen, T.D., & Zawislanski, P.T. Selenium isotope ratios as indicators of selenium sources and oxyanion reduction. United States. doi:10.1016/S0016-7037(99)00279-3.
Johnson, T.M., Herbel, M.J., Bullen, T.D., and Zawislanski, P.T. Wed . "Selenium isotope ratios as indicators of selenium sources and oxyanion reduction". United States. doi:10.1016/S0016-7037(99)00279-3.
@article{osti_20000935,
title = {Selenium isotope ratios as indicators of selenium sources and oxyanion reduction},
author = {Johnson, T.M. and Herbel, M.J. and Bullen, T.D. and Zawislanski, P.T.},
abstractNote = {Selenium stable isotope ratio measurements should serve as indicators of sources and biogeochemical transformations of Se. The authors report measurements of Se isotope fractionation during selenate reduction, selenite sorption, oxidation of reduced Se in soils, and Se volatilization by algae and soil samples. These results, combined with previous work with Se isotopes, indicate that reduction of soluble oxyanions is the dominant cause of Se isotope fractionation. Accordingly, Se isotope ratios should be useful as indicators of oxyanion reduction, which can transform mobile species to forms that are less mobile and less bioavailable. Additional investigations of Se isotope fractionation are needed to confirm this preliminary assessment. The authors have developed a new method for measurement of natural Se isotope ratio variation which requires less than 500 ng Se per analysis and yields {+-}0.2% precision on {sup 80}Se/{sup 76}Se. A double isotope spike technique corrects for isotopic fractionation during sample preparation and mass spectrometry. The small minimum sample size is important, as Se concentrations are often below 1 ppm in solids and 1 {micro}g/L in fluids. The Se purification process is rapid and compatible with various sample matrices, including acidic rock or sediment digests.},
doi = {10.1016/S0016-7037(99)00279-3},
journal = {Geochimica et Cosmochimica Acta},
issn = {0016-7037},
number = 18,
volume = 63,
place = {United States},
year = {1999},
month = {9}
}