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Jin, X. ; Kengara, F.O. ; Yue, X.* ; Wang, F.* ; Schroll, R. ; Munch, J.C.* ; Gu, C.* ; Jiang, X.*

Shorter interval and multiple flooding-drying cycling enhanced the mineralization of C-14-DDT in a paddy soil.

Sci. Total Environ. 676, 420-428 (2019)

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DDT and its main metabolites (DDTs) are still the residual contaminants in soil. Sequential anaerobic-aerobic cycling has long been approved for enhancing the degradation of DDTs in soil. However, there is a lack of study investigating whether anaerobic-aerobic cycling would enhance the mineralization of DDT, and what a kind of anaerobic-aerobic management regimes would be optimal. To fill these gaps, the fate of ¹⁴C-DDT under different flooding-drying cycles was examined in a paddy soil by monitoring its mineralization and bioavailability. The results show the total mineralization of ¹⁴C-DDT in 314 days accounted for 1.01%, 1.30%, and 1.41%, individually for the treatments subjected to one, two, and three flooding-drying cycles. By comparison, the treatment subjected to the permanently aerobic phase had only 0.12% cumulative mineralization. Shorter intervals and multiple flooding-drying cycles enhanced the mineralization of ¹⁴C-DDT, however, reduced its bioavailability. Therefore, the enhanced mineralization was explained from an abiotic pathway as predicted by the one-electron reduction potential (E₁), the Fukui function for nucleophilic attack (f⁺) and the steps for anaerobic decarboxylation. From a practical view, it is important to investigate how the anaerobic-aerobic interval and frequency would affect the degradation and mineralization of DDT, which is very essential in developing remediation strategies.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords 14 C-ddt ; Anaerobic-aerobic Cycling ; Dft Calculation ; Mineralization

ISSN (print) / ISBN 0048-9697

e-ISSN 1879-1026

Journal Science of the Total Environment, The

Quellenangaben Volume: 676, Pages: 420-428

Publisher Elsevier

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Network Biology (INET)
Research Unit Microbe-Plant Interactions (AMP)