Abstract
Benzo[a]pyrene (BaP) biodegradation by Stenotrophomonas maltophilia was studied under the influence of co-existed Cu(II) ions. About 45% degradation was achieved within 3d when dealing with 1mgL−1 BaP under initial natural pH at 30°C; degradation reached 48% in 2d at 35°C. Efficacy of BaP biodegradation reached the highest point at pH 4. In the presence of 10mgL−1 Cu(II) ions, the BaP removal ratio was 45% on 7th day, and maintained stable from 7 to 14d at 30°C under natural pH. The favorable temperature and pH for BaP removal was 25°C and 6.0 respectively, when Cu(II) ions coexisted in the solutions. Experiments on cometabolism indicated that S. maltophilia performed best when sucrose was used as an additional carbon source. GC–MS analysis revealed that the five rings of BaP opened, producing compounds with one or two rings which were more bioavailable.
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