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Int. J. Environ. Res. Public Health 2010, 7(4), 1612-1621; doi:10.3390/ijerph7041612

Effects of Soil Oxygen Conditions and Soil pH on Remediation of DDT-contaminated Soil by Laccase from White Rot Fungi

1
Department of Applied Chemistry, South China Agricultural University, Guangzhou 510642, China
2
College of Environmental Science and Engineering, South China University of Science & Technology, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Received: 25 February 2010 / Revised: 25 March 2010 / Accepted: 2 April 2010 / Published: 7 April 2010
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Abstract

High residues of DDT in agricultural soils are of concern because they present serious threats to food security and human health. This article focuses on remediation of DDT-contaminated soil using laccase under different soil oxygen and soil pH conditions. The laboratory experiment results showed significant effects of soil oxygen conditions and soil pH on remediation of DDT-contaminated soil by laccase at the end of a 25-d incubation period. This study found the positive correlation between the concentration of oxygen in soil and the degradation of DDT by laccase. The residue of DDTs in soil under the atmosphere of oxygen decreased by 28.1% compared with the atmosphere of nitrogen at the end of the incubation with laccase. A similar pattern was observed in the remediation of DDT-contaminated soil by laccase under different flooding conditions, the higher the concentrations of oxygen in soil, the lower the residues of four DDT components and DDTs in soils. The residue of DDTs in the nonflooding soil declined by 16.7% compared to the flooded soil at the end of the incubation. The residues of DDTs in soils treated with laccase were lower in the pH range 2.5–4.5. View Full-Text
Keywords: laccase; DDT-contaminated soil; remediation; soil oxygen conditions; soil pH laccase; DDT-contaminated soil; remediation; soil oxygen conditions; soil pH
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Zhao, Y.; Yi, X. Effects of Soil Oxygen Conditions and Soil pH on Remediation of DDT-contaminated Soil by Laccase from White Rot Fungi. Int. J. Environ. Res. Public Health 2010, 7, 1612-1621.

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