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Tracking transformation processes of organic micropollutants in aquatic environments using multi-element isotope fractionation analysis

2011-06-01
Hofstetter, Thomas B.
Bolotin, Jakov
Skarpeli-Liati, Marita
Wijker, Reto
Kurt, Zöhre
Nishino, Shirley F.
Spain, Jim C.
The quantitative description of enzymatic or abiotic transformations of man-made organic micropollutants in rivers, lakes, and groundwaters is one of the major challenges associated with the risk assessment of water resource contamination. Compound-specific isotope analysis enables one to identify (bio)degradation pathways based on changes in the contaminants' stable isotope ratios even if multiple reactive and non-reactive processes cause concentrations to decrease. Here, we investigated how the magnitude and variability of isotope fractionation in some priority pollutants is determined by the kinetics and mechanisms of important enzymatic and abiotic redox reactions. For nitroaromatic compounds and substituted anilines, we illustrate that competing transformation pathways can be assessed via trends of N and C isotope signatures. (C) 2011 Elsevier Ltd. All rights reserved.