EurekaMag.com logo
+ Site Statistics
References:
53,869,633
Abstracts:
29,686,251
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Se Isotopes as Groundwater Redox Indicators: Detecting Natural Attenuation of Se at an in Situ Recovery U Mine



Se Isotopes as Groundwater Redox Indicators: Detecting Natural Attenuation of Se at an in Situ Recovery U Mine



Environmental Science & Technology (): -



NlmCategory="UNASSIGNED">One of the major ecological concerns associated with the in situ recovery (ISR) of uranium (U) is the environmental release of soluble, toxic selenium (Se) oxyanions generated by mining. Post-mining natural attenuation by the residual reductants in the ore body and reduced down-gradient sediments should mitigate the risk of Se contamination in groundwater. In this work, we investigate the Se concentrations and Se isotope systematics of groundwater and of U ore bearing sediments from an ISR site at Rosita, TX, USA. Our results show that selenate (Se(VI)) is the dominant Se species in Rosita groundwater, and while several up-gradient wells have elevated Se(VI), the majority of the ore zone and down-gradient wells have little or no Se oxyanions. In addition, the δ82SeVI of Rosita groundwater is generally elevated relative to the U ore up to +6.14‰, with the most enriched values observed in the ore-zone wells. Increasing δ82Se with decreasing Se(VI) conforms to a Rayleigh type distillation model with an ε of -2.25‰ ± 0.61‰, suggesting natural Se(VI) reduction occurring along the hydraulic gradient at the Rosita ISR site. Furthermore, our results show that Se isotopes are excellent sensors for detecting and monitoring post-mining natural attenuation of Se oxyanions at ISR sites.

(PDF emailed within 0-6 h: $19.90)

Accession: 058814281

Download citation: RISBibTeXText

PMID: 27547844

DOI: 10.1021/acs.est.6b01464



Related references

Investigating natural attenuation and sources of nitrate in groundwater using stable isotopes and other techniques. Eos, Transactions, American Geophysical Union 84(46, Suppl, 2003

Does phosphate enhance the natural attenuation of crude oil in groundwater under defined redox conditions?. Journal of Contaminant Hydrology 169: 4-18, 2015

Natural attenuation of ground water constituents at an in situ uranium mine. Abstracts with Programs - Geological Society of America 28(7): 467, 1996

In situ and laboratory studies of natural attenuation of acid mine drainage. Abstracts with Programs - Geological Society of America 38(2): 34, 2006

Evaluation of the potential for natural attenuation and in situ bioprecipitation of chromium in groundwater. In situ and on site bioremediation 2003 Proceedings of the Seventh International In Situ and On Site Bioremediation Symposium, Orlando, Florida, USA, 2-5 June, 2003: L07, 2004

Enhanced natural attenuation of CAHs in groundwater using bio-barrier; 1, Long-term monitoring of enhanced natural attenuation effect and groundwater qualities. Journal of Groundwater Hydrology 47(2): 199-215, 2005

Biogeochemical processes in the natural attenuation of acid-contaminated groundwater at Davis pyrite mine in Rowe, Massachusetts. Abstracts with Programs - Geological Society of America 36(5): 398, 2004

Determination of contaminant levels and remediation efficacy in groundwater at a former in situ recovery uranium mine. Journal of Environmental Monitoring 14(7): 1814-1823, 2012

A modified radial diagram approach for evaluating natural attenuation trends for chlorinated solvents and inorganic redox indicators. Ground Water Monitoring and Remediation 23(4): 75-84, 2003

Geochemical data from groundwater at the proposed Dewey Burdock uranium in-situ recovery mine, Edgemont, South Dakota. U. S. Geological Survey: 5, 2012

In situ source zone sediment mixing coupled to groundwater biostimulation to enhance phenol natural attenuation. Water Science and Technology 66(1): 130-137, 2012

Long-term groundwater monitoring optimization: Improving performance and reducing costs associated with natural attenuation and other in situ treatments. Bioremediation Journal 8(3-4): 87-88, 2004

Optimal groundwater remediation design considering effects of natural attenuation processes; pumping strategy with enhanced-natural-attenuation. Geosciences Journal (Seoul) 11(4): 377-385, 2007

Evaluation of immobilized redox indicators as reversible, in situ redox sensors for determining Fe(III)-reducing conditions in environmental samples. Talanta 55(4): 699-714, 2001

Evaluation of immobilized redox indicators as reversible, in situ redox sensors for determining Fe(III)-reducing conditions in environmental samples. Talanta 55(4): 699-714, 2008