Combined Source Apportionment and Degradation Quantification of organic Pollutants with CSIA: 1 Model Derivation.

S.R. Lutz, B.M. van Breukelen

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    Compound-specific stable isotope analysis (CSIA) serves as a tool for source apportionment (SA) and for the quantification of the extent of degradation (QED) of organic pollutants. However, simultaneous occurrence of mixing of sources and degradation is generally believed to hamper both SA and QED. On the basis of the linear stable isotope mixing model and the Rayleigh equation, we developed the stable isotope sources and sinks model, which allows for simultaneous SA and QED of a pollutant that is emitted by two sources and degrades via one transformation process. It was shown that the model necessitates at least dual-element CSIA for unequivocal SA in the presence of degradation-induced isotope fractionation, as illustrated for perchlorate in groundwater. The model also enables QED, provided degradation follows instantaneous mixing of two sources. If mixing occurs after two sources have degraded separately, the model can still provide a conservative estimate of the overall extent of degradation. The model can be extended to a larger number of sources and sinks as outlined. It may aid in forensics and natural attenuation assessment of soil, groundwater, surface water, or atmospheric pollution. © 2014 American Chemical Society.
    Original languageEnglish
    Pages (from-to)6220-6228
    JournalEnvironmental Science and Technology
    Volume48
    Issue number11
    DOIs
    Publication statusPublished - 2014

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