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Co‐amendment with halogenated compounds enhances anaerobic microbial dechlorination of 1,2,3,4‐tetrachlorodibenzo‐ p ‐dioxin and 1,2,3,4‐tetrachlorodibenzofuran in estuarine sediments
Author(s) -
Ahn YoungBeom,
Häggblom Max M.,
Fennell Donna E.
Publication year - 2005
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1897/05-010r.1
Subject(s) - reductive dechlorination , environmental chemistry , bay , chemistry , microcosm , amendment , halocarbon , biodegradation , geology , organic chemistry , oceanography , political science , law
Halogenated coamendments enhanced dechlorination of 31 μM of spiked 1,2,3,4‐tetrachlorodibenzo‐ p ‐dioxin (TeCDD) and 49 μM of spiked 1,2,3,4‐tetrachlorodibenzofuran (TeCDF) in sediments from San Diego Bay (CA, USA) and Tuckerton (NJ, USA). Dechlorination of 1,2,3,4‐TeCDD occurred to a greater extent under methanogenic than under sulfate‐reducing conditions. The most effective stimulation of 1,2,3,4‐TeCDD dechlorination occurred with coamendment of 25 μM of 1,2,3,4‐tetrachlorobenzene (TeCB), 2,3,4,5‐tetrachloroanisole (TeCA), 2,3,4,5‐tetrachlorophenol, or 2′,3′,4′‐trichloroacetophenone plus 500 μM lactate and 500 μM propionate as electron donors. The 1,2,3,4‐TeCDD dechlorination was evident after three months and sequentially produced mainly 1,2,4‐trichlorodibenzo‐ p ‐dioxin, 1,3‐dichlorodibenzo‐ p ‐dioxin, and 2‐monochlorodibenzo‐ p ‐dioxin (MCDD). Monobromo‐phenols (2‐bromo‐, 3‐bromo‐, and 4‐bromophenol), monochlorophenols (2‐chloro‐, 3‐chloro‐, and 4‐chlorophenol), 2,3,5,6‐tetra‐chlorobenzoate, or electron donors alone stimulated less 1,2,3,4‐TeCDD dechlorination, with activity apparent only after six months. The 1,2,3,4‐TeCDD dechlorination produced 50 mol % 2‐MCDD after six months in sediments from the more contaminated Graving Dock and Paleta Creek sites in San Diego Bay. The 1,2,3,4‐TeCDD dechlorination by sediments from the less contaminated Shelter Island site in San Diego Bay and in pristine Tuckerton sediments did not produce 2‐MCDD. Dechlorination of 1,2,3,4‐TeCDF to tri‐ and dichlorinated daughter products was significantly enhanced by TeCB and TeCA. These results suggest that halogenated aromatic compounds with structural similarity to 1,2,3,4‐TeCDD/F stimulate bacteria with the ability to dechlorinate chlorinated dibenzo‐ p ‐dioxin and furans.