Anthropogenic organic pollutants have been commonly detected in the Arctic, and include new classes of brominated flame retardants (BFRs) and current use pesticides (CUPs). In this study, we focus on the environmental fate of chlorpyrifos (CUP) and tetrabromobisphenol A (TBBPA, a flame retardant). These two chemicals have been detected in various environmental compartments in the Arctic and are transported there by global distillation. One process that can limit exposure and bioaccumulation of these compounds is through their interactions with Arctic dissolved and particulate organic matter (DOM and POM respectively). We hypothesize that the presence of DOM in Arctic surface waters at sufficiently high enough concentrations (from 3 to &gt; 10 mg/L) will bind these chemicals thereby making them less bioavailable. Solubility enhancement studies for chlorpyrifos and TBBPA were conducted with various types of Arctic DOM (Toolik Lake and a tundra seep adjacent the Sagavanirktok River). We report log KDOM values for chlorpyrifos of 3.7 for Toolik Lake, 3.3 for Suwannee River, 3.5 for Oksrukuyik River, and 3.6 for Sagavanirktok River DOM. These values are consistent with a calculated poly- parameter linear free energy relationship (pp-LFER ) value of 3.7. Sorption of these analytes to POM were also conducted and our partition coefficients are in good agreement with those reported in the literature. Surprisingly, we observed loss of TBBPA in the presence of DOM, which may be the result of an unknown abiotic degradation pathway. Experiments investigating this phenomenon are ongoing.

Partitioning of chlorpyrifos and tetrabromobisphenol A to sediments and dissolved organic matter in arctic lakes

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.