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Brahushi, F. ; Dörfler, U. ; Schroll, R. ; Munch, J.-C.

Stimulation of reductive dechlorination of hexachlorobenzene in soil by inducing the native microbial activity.

Chemosphere 55, 1477-1484 (2004)

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Open Access Green as soon as Postprint is submitted to ZB.

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The reductive dechlorination and behaviour of ¹⁴C-hexachlorobenzene (HCB) was investigated in an arable soil. The activity of the native anaerobic microbial communities could be induced by saturating the soil with water. Under these conditions high rates of dechlorination were observed. After 20 weeks of incubation only 1% of the applied ¹⁴C-HCB could be detected in the fraction of extractable residues. Additional organic substances, like wheat straw and lucerne straw, however considerably delayed and reduced the dechlorination process in the soil. The decline of HCB was not only caused by dechlorination but also by the formation of non-extractable residues, whereby their amounts varied with time depending on the experimental conditions. Several dechlorination products were detected, indicating the following main HCB transformation pathway: HCB → PCB → 1,2,3,5-TeCB → 1,3,5-TCB → 1,3-DCB, with 1,3,5-TCB as main intermediate dechlorination product. The other TeCB-, TCB- and DCB-isomers were also detected in low amounts, showing the presence of more than one dechlorination pathway. Since the methane production rates were lowest when the dechlorination rates were highest, it can be assumed that methanogenic bacteria were not involved in the dechlorination process of HCB. The established ¹⁴C-mass balances show, that with increasing dechlorination and incubation times, the ¹⁴C-recoveries decreased.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords hexachlorobenzene; reductive dechlorination; soil; methane; non-extractable residues

ISSN (print) / ISBN 0045-6535

e-ISSN 1879-1298

Journal Chemosphere

Quellenangaben Volume: 55, Issue: 11, Pages: 1477-1484

Publisher Elsevier

Publishing Place Kidlington, Oxford

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Soil Ecology (IBOE)