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Title: Real-Time XANES Measurement of Se Reduction by Zerovalent Iron in a Flow-through Cell, and Accompanying Se Isotope Measurements

Journal Article · · Environmental Science and Technology
ORCiD logo [1];  [1];  [1];  [1]
  1. Univ. of Waterloo, ON (Canada)
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An anoxic flow-through cell experiment was conducted to examine mechanisms controlling the real-time reduction of selenate (Se(VI)) by zerovalent iron (ZVI), which is commonly used in permeable reactive barriers to treat dissolved contaminants including Se(VI). Changes in selenium (Se) isotope composition were examined by increasing the influent Se concentration over time, thus changing the proportion of Se removed from solution. At the conclusion of the experiment, an anoxic Se-free solution was pumped through the cell to assess the stability of the reaction products. At all stages, X-ray absorption data were obtained from the solid phase and Se isotope data from the aqueous phase. Reduced Se in the form of adsorbed Se(IV), Fe2SeO4, Se(0), and iron selenides accumulated on the ZVI over time. A linear regression function was fit to the $$δ$$82/76Se values of the effluent, yielding an isotopic separation of 9.6‰. A Rayleigh curve was fit to the isotope data from the effluent samples collected during the rinse stage with an effective fractionation of 2.4‰. The results from this experiment can be used to elucidate the effect of multiple concurrent mechanisms on Se isotope behavior.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
Natural Sciences and Engineering Research Council of Canada (NSERC); Canada Research Chair; Ontario Research Fund; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
FG02-94ER14466; AC02-06CH11357
OSTI ID:
1471633
Journal Information:
Environmental Science and Technology, Vol. 52, Issue 16; ISSN 0013-936X
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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  • López de Arroyabe Loyo, Raquel; Nikitenko, Sergei I.; Scheinost, Andreas C.
  • Environmental Science & Technology, Vol. 42, Issue 7 https://doi.org/10.1021/es702579w
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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Redox reactions
Fractionation
Solution chemistry
Selenium
Isotopes