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Dissolved organic matter mediated aquatic transport of chlorinated dioxins |
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| Authors: | G.R.B. Webster D.H. Muldrew J.J. Graham L.P. Sarna D.C.G. Muir |
| Affiliation: | 1 Pesticide Research Laboratory, Department of Soil Science, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2 2 Freshwater Institute, Department of Fisheries and Oceans, 501 University Crescent, Winnipeg, Manitoba, Canada R3T 2N2 |
| Abstract: | The bioavailability and environmental fate of extremely hydrophobic environmental contaminants such as chlorinated dioxins is linked to their solubility characteristics in water. Solubilities of three chlorinated dioxins, viz., 1,2,3,7-T4CDD, 1,2,3,4,7-P5CDD, and 1,2,3,4,7,8-H6CDD, were determined in pure water using a glass bead generator column technique, and their enhanced solubilities in the presence of several dissolved humic fractions quantified at 20, 30 and 40°C. The strengths of these interactions between chlorodioxins and the dissolved humic substances, viz., a fulvic acid, a humic acid, and Aldrich humic acid, were examined using simple thermodynamic calculations. A new partition/association coefficient, Koc (mobile) is defined. |
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