The binding of three PCB congeners to dissolved organic carbon in freshwaters |
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Authors: | Hayla E Evans |
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Institution: | University of Toronto, Department of Zoology 25 Harbord St., Toronto, Ontario, Canada M5S 1A1 |
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Abstract: | The binding of three polychlorinated biphenyl (PCB) congeners to natural levels of dissolved organic carbon (DOC) was measured in 12 lakes and streams using Sep-Pak C18 columns. The association coefficients calculated on the basis of DOC (i.e. KDOC mL/g C), varied by over an order of magnitude among the different freshwaters and ranged between 2.05 × 102 and 8.86 × 103 mL/g C for PCB 52 and 1.03 × 104 and 1.70 × 105 mL/g C for PCB 153. In general, there were no significant correlations (p > 0.05) between the KDOC values and various chemical parameters in the study lakes and streams. A relationship was derived between the fraction of bound PCB and the octanol-water partition coefficient. While this relationship explained almost 50% of the variation in the observed data, it is apparent that other factors influence KDOC values and that in natural freshwaters, only a small fraction of the DOC is involved in the binding of PCBs and other hydrophobic pollutants. |
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