Iron-bearing minerals are an important reductant for many anthropogenic pollutants during coupled biotic and abiotic processes. Despite an abundance of these minerals in the subsurface, pollutant transformation is often limited by competition for (bio)available Fe(II) and complex hydrogeologic conditions. In situ chemical reduction (ISCR) is one approach to circumvent many of these issues. Perturbations introduced to the subsurface by ISCR, however, present a challenge in quantifying pollutant concentrations and thus the extent of remediation. In this study, compound specific isotope analysis (CSIA) was used to characterize C and N isotope fractionation associated with the reduction of 2,4-dinitroanisole (DNAN) by a suite of iron-bearing minerals and under various matrix conditions including systems representing ISCR. These data were used to generate models of DNAN transformation based on measurements of δ15N and make quantitative estimates of DNAN removal. Not only was isotope fractionation unaffected in each set of conditions, but also the model was applied in a blind study to accurately predict the extent of DNAN transformation from δ15N measurements. These observations illustrate the utility of CSIA as a robust analytical method to evaluate the success of in situ remediation techniques. These results are applicable to other nitroaromatic compounds in the subsurface and are important given the continuing need for assessment of the success of in situ remediation techniques.

Quantifying 2,4-dinitroanisole transformation using compound specific isotope analysis after in situ chemical reduction of iron oxides

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.