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- W2000236019 abstract "The susceptibility of dioxins to dissolved organic carbon (DOC)-mediated dechlorination reactions was investigated using 1,2,3,4,6,7,9-heptachlorodibenzo-p-dioxin (HpCDD), Aldrich humic acid (AHA), and polymaleic acid (PMA) as model compounds. The dechlorination yields were on the order of 4−20% which, when normalized to phenolic acidity, was comparable to yields observed in the presence of the humic constituents catechol and resorcinol. Based on the ratio of dechlorination yields as a function of phenolic acidity and electron transfer capacity, differences in electron transfer efficiency to dioxins are likely combined effects of specific interactions with the functional groups and nonspecific hydrophobic interactions. Hexa- and pentaCDD homologues were dominant in all incubations, and diCDD constituted the final product of dechlorination. The rates of appearance of lesser chlorinated products (pM-nM/d) were similar to those observed in sediment systems and followed thermodynamic considerations as they decreased with a decrease in level of chlorination. Generally, both absolute and phenolic acidity-normalized rate constants for AHA-mediated reactions were up to 2-fold higher than those effected by PMA. These results indicate that the electron shuttling capacity of sediment DOC may significantly affect the fate of dioxins, in part through dechlorination reactions." @default.
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- W2000236019 date "1999-09-24" @default.
- W2000236019 modified "2023-10-12" @default.
- W2000236019 title "Reductive Transformation of Dioxins: An Assessment of the Contribution of Dissolved Organic Matter to Dechlorination Reactions" @default.
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- W2000236019 doi "https://doi.org/10.1021/es981342w" @default.
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