Assessing the Degradation of Munitions Compounds by Compound Specific Isotope Analysis in Natural and Engineered Environments (2021-11-19)
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Assessing the Degradation of Munitions Compounds by Compound Specific Isotope Analysis in Natural and Engineered Environments (2021-11-19)
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2021
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Abstract
Iron-bearing minerals are important reductants in the contaminated subsurface,
but their availability for the reduction of anthropogenic pollutants is often
limited by competition with other electron acceptors including microorganisms
and poor accessibility to Fe(II) in complex hydrogeologic settings. The supply of
external electron donors through in situ chemical reduction (ISCR) has been
proposed as one remediation approach, but the quantification of pollutant
transformation is complicated by the perturbations introduced to the
subsurface by ISCR. Here, we evaluate the application of compound specific
isotope analysis (CSIA) for monitoring the reduction of 2,4-dinitroanisole
(DNAN), a component of insensitive munitions formulations, by mineral-bound
Fe(II) generated through ISCR of subsurface material from two field sites.
Electron balances from laboratory experiments in batch and column reactors
showed that 3.6% to 11% of the total Fe in the sediments was available for the
reduction of DNAN and its partially reduced intermediates after dithionite
treatment. The extent of DNAN reduction was successfully quantified from its N
isotope fractionation measured in the column effluent based on the derivation
of a N isotope enrichment factor, ?N, derived from a comprehensive series of
isotope fractionation experiments with numerous Fe(II)-bearing minerals as well
as dithionite-reduced subsurface materials. Our observations illustrate the utility
of CSIA as a robust approach to evaluate the success of in situ remediation
through abiotic contaminant reduction.
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Friday, November 19, 2021, 3:00 p.m.; Chem 200; Dr. Matthew Berens, Post-doctoral Associate, Natural Resources Research Institute, University of Minnesota Duluth
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Berens, Matthew; University of Minnesota Duluth. Department of Chemistry and Biochemistry. (2021). Assessing the Degradation of Munitions Compounds by Compound Specific Isotope Analysis in Natural and Engineered Environments (2021-11-19). Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/227611.
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