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Degradation mechanisms of benzo[a]pyrene and its accumulated metabolites by biodegradation combined with chemical oxidation

Zang, Shuyan, Li, Peijun, Li, Wenxiu, Zhang, Dong and Hamilton, Andrew 2007, Degradation mechanisms of benzo[a]pyrene and its accumulated metabolites by biodegradation combined with chemical oxidation, Chemosphere, vol. 67, no. 7, pp. 1368-1374, doi: 10.1016/j.chemosphere.2006.10.034.

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Title Degradation mechanisms of benzo[a]pyrene and its accumulated metabolites by biodegradation combined with chemical oxidation
Author(s) Zang, Shuyan
Li, Peijun
Li, Wenxiu
Zhang, Dong
Hamilton, Andrew
Journal name Chemosphere
Volume number 67
Issue number 7
Start page 1368
End page 1374
Publisher Pergamon
Place of publication Oxford, England
Publication date 2007-04
ISSN 0045-6535
1879-1298
Keyword(s) BaP
metabolites
biodegradation
hydrogen peroxide
oxidation
Summary A high degradation extent of benzo[a]pyrene (BaP) should not be considered as the sole desirable criterion for the bioremediation of BaP-contaminated soils because some of its accumulated metabolites still have severe health risks to human. Two main metabolites of BaP, benzo[a]pyrene-1,6-quinone (BP1,6-quinone) and 3-hydroxybenzo[a]pyrene (3-OHBP) were identified by high performance liquid chromatography (HPLC) with standards. This study was the first time that degradation of both BaP and the two metabolites was carried out by chemical oxidation and biodegradation. Three main phases during the whole degradation process were proposed.

Hydrogen peroxide–zinc (H2O2–Zn), the fungus – Aspergillus niger and the bacteria – Zoogloea sp. played an important role in the different phases. The degradation parameters of the system were also optimized, and the results showed that the effect of degradation was the best when fungus–bacteria combined with H2O2–Zn, the concentration range of BaP in the cultures was 30–120 mg/l, the initial pH of the cultures was 6.0. However, as co-metabolites, phenanthrene significant inhibited the degradation of BaP. This combined degradation system compared with the conventional method of degradation by domestic fungus only, enhanced the degradation extent of BaP by more than 20% on the 12 d. The highest accumulation of BP1,6-quinone and 3-OHBP were reduced by nearly 10% in the degradation experiments, which further proved that the combined degradation system was more effective as far as joint toxicity of BaP and its metabolites are concerned.
Language eng
DOI 10.1016/j.chemosphere.2006.10.034
Field of Research 050299 Environmental Science and Management not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2006, Elsevier Ltd.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007057

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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