Research output: Contribution to Journal/Magazine › Journal article › peer-review
Impact of zinc-copper mixtures on the development of phenanthrene catabolism in soil. / Obuekwe, Ifeyinwa S.; Semple, Kirk T.
In: International Biodeterioration and Biodegradation, Vol. 85, 11.2013, p. 228-236.Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Impact of zinc-copper mixtures on the development of phenanthrene catabolism in soil
AU - Obuekwe, Ifeyinwa S.
AU - Semple, Kirk T.
PY - 2013/11
Y1 - 2013/11
N2 - Anthropogenic pollutants rarely occur in the environment as single constituents, thus combination effects rather than separate effects of pollutants are expected to occur in the environment. PAH contamination of soil is often associated with the presence of high levels of potentially toxic metals which may impact on PAH biodegradation. In this study, the impact of zinc and copper mixtures (0, 50,100, 500 and 1000 mg kg(-1)) on the development of phenanthrene catabolism and impact on bacterial numbers in soil were investigated over 168 day incubation. The presence of low concentrations of Zn and Cu (50 and 100 mg kg(-1)) had no significant effect (p > 0.05) on the development of phenanthrene catabolism, but phenanthrene biodegradation was significantly reduced at higher concentrations of Zn + Cu mixture (p <0.05). Bacterial cell numbers decreased significantly in the higher concentrations of the mixtures relative to the control. Thus, in soils impacted with organic and metallic contaminants, biodegradation may be inhibited. (C) 2013 Elsevier Ltd. All rights reserved.
AB - Anthropogenic pollutants rarely occur in the environment as single constituents, thus combination effects rather than separate effects of pollutants are expected to occur in the environment. PAH contamination of soil is often associated with the presence of high levels of potentially toxic metals which may impact on PAH biodegradation. In this study, the impact of zinc and copper mixtures (0, 50,100, 500 and 1000 mg kg(-1)) on the development of phenanthrene catabolism and impact on bacterial numbers in soil were investigated over 168 day incubation. The presence of low concentrations of Zn and Cu (50 and 100 mg kg(-1)) had no significant effect (p > 0.05) on the development of phenanthrene catabolism, but phenanthrene biodegradation was significantly reduced at higher concentrations of Zn + Cu mixture (p <0.05). Bacterial cell numbers decreased significantly in the higher concentrations of the mixtures relative to the control. Thus, in soils impacted with organic and metallic contaminants, biodegradation may be inhibited. (C) 2013 Elsevier Ltd. All rights reserved.
KW - Zinc
KW - Copper
KW - Phenanthrene
KW - Catabolism
KW - Soil
KW - POLYCYCLIC AROMATIC-HYDROCARBONS
KW - HEAVY-METAL CONTAMINATION
KW - NAPHTHALENE BIODEGRADATION
KW - MICROBIAL-DEGRADATION
KW - AGRICULTURAL SOILS
KW - PYRENE CATABOLISM
KW - CADMIUM TOXICITY
KW - MICROORGANISMS
KW - BIOAUGMENTATION
KW - BIOREMEDIATION
U2 - 10.1016/j.ibiod.2013.08.001
DO - 10.1016/j.ibiod.2013.08.001
M3 - Journal article
VL - 85
SP - 228
EP - 236
JO - International Biodeterioration and Biodegradation
JF - International Biodeterioration and Biodegradation
SN - 0964-8305
ER -