John Wiley & Sons, Ltd.

Effects of dissolved organic matter from a eutrophic lake on the freely dissolved concentrations of emerging organic contaminants

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The authors studied the effects of dissolved organic matter (DOM) on the bioavailability of bisphenol A (BPA) and chloramphenicol (CAP) by measuring the freely dissolved concentrations (FDCs) of the contaminants in solutions containing DOM that had been isolated from a mesocosm in a eutrophic lake. The abundance and aromaticity of the chromophoric DOM (CDOM) increased over the 25 d mesocosm experiment. The BPA FDC was 72.3% lower and the CAP FDC was 56.2% lower using DOM collected on day 25 than using DOM collected on day 1 of the mesocosm experiment. The FDCs negatively correlated with the ultraviolent absorption coefficient at 254 nm and positively correlated with the spectral slope of CDOM, suggesting that the bioavailability of these emerging organic contaminants (EOCs) depends on the characteristics of the DOM present. The DOM–water partition coefficients (log KOC) for the EOCs positively correlated with the aromaticity of the DOM, measured as humic‐like fluorescent components C1 (Ex/Em = 250(313)/412 nm) and C2 (Ex/Em = 268(379)/456 nm). We conclude that the bioavailability of EOCs in eutrophic lakes can be affected by the changes in the DOM. Environ Toxicol Chem © 2014 SETAC

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