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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)
DOI PMC
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
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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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter 14 C-ddt ; Anaerobic-aerobic Cycling ; Dft Calculation ; Mineralization
ISSN (print) / ISBN 0048-9697
e-ISSN 1879-1026
Zeitschrift Science of the Total Environment, The
Quellenangaben Band: 676, Heft: , Seiten: 420-428 Artikelnummer: , Supplement: ,
Verlag Elsevier
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Network Biology (INET)
Research Unit Microbe-Plant Interactions (AMP)