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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. 相似文献
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Water solubilities (SW) determined by the HPLC generator column method are reported for a series of chlorinated dibenzo--dioxins (PCDDs) with SW ranging from 0.4 ng/L (ppt) for octa-chlorodibenzo--dioxin to 430 ng/L for 1,2,3,7-tetrachlorodibenzo--dioxin at 20°C. A correlation is demonstrated between SW and HPLC capacity factors (k′) for these extremely hydrophobic compounds, allowing calculation of SW of PCDDs from k′ and melting point data. 相似文献
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