TY - JOUR
T1 - Effects of metals on biosorption and biodegradation of mixed polycyclic aromatic hydrocarbons by a freshwater green alga Selenastrum capricornutum
AU - Ke, Lin
AU - Luo, Lijuan
AU - Wang, Ping
AU - Luan, Tiangang
AU - Tam, Nora Fung Yee
N1 - Funding Information:
The work described in this paper was supported by a SRG research grant from City University of Hong Kong ( 7002316 ). The authors thank Benz Chan and Xiaowei Wang for their assistance and comments in GC–MS analysis.
PY - 2010/9
Y1 - 2010/9
N2 - The effects of metals (cadmium, zinc, copper and nickel in a mixture) on biosorption and biodegradation of five mixed polycyclic aromatic hydrocarbons (PAHs), namely fluorene (FLU), phenanthrene (PHE), fluoranthrene (FLA), pyrene (PYR) and benzo[a]pyrene (BAP), by Selenastrum capricornutum were investigated. Exposure to metals significantly influenced the interactions between cells and PAHs and, such impact was PAH species dependent. For low molecular weight PAHs (FLU and PHE), both metal dosage and exposure time posed a significant, positive effect on their removal, with up to 99% of FLU and 89% of PHE were removed from the medium in seven days, which was mainly due to the cellular degradation induced by metal stress. For high molecular weight PAHs (FLA, PYR and BAP), the presence of metals did not affect the removal efficiency, but the uptake in the ethyl acetate-extractable fraction of the biomass was increased.
AB - The effects of metals (cadmium, zinc, copper and nickel in a mixture) on biosorption and biodegradation of five mixed polycyclic aromatic hydrocarbons (PAHs), namely fluorene (FLU), phenanthrene (PHE), fluoranthrene (FLA), pyrene (PYR) and benzo[a]pyrene (BAP), by Selenastrum capricornutum were investigated. Exposure to metals significantly influenced the interactions between cells and PAHs and, such impact was PAH species dependent. For low molecular weight PAHs (FLU and PHE), both metal dosage and exposure time posed a significant, positive effect on their removal, with up to 99% of FLU and 89% of PHE were removed from the medium in seven days, which was mainly due to the cellular degradation induced by metal stress. For high molecular weight PAHs (FLA, PYR and BAP), the presence of metals did not affect the removal efficiency, but the uptake in the ethyl acetate-extractable fraction of the biomass was increased.
KW - Bioaccumulation
KW - Co-contamination
KW - Microalgae
KW - PAH intermediates
UR - http://www.scopus.com/inward/record.url?scp=77953143058&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2010.04.011
DO - 10.1016/j.biortech.2010.04.011
M3 - Article
C2 - 20435470
AN - SCOPUS:77953143058
SN - 0960-8524
VL - 101
SP - 6950
EP - 6961
JO - Bioresource Technology
JF - Bioresource Technology
IS - 18
ER -
