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

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dc.contributor.author Xin Jin, Fredrick O Kengara, Xianhui Yue, Fang Wang, Reiner Schroll, Jean C Munch, Cheng Gu, Xin Jiang
dc.date.accessioned 2020-07-21T13:09:54Z
dc.date.available 2020-07-21T13:09:54Z
dc.date.issued 2019-08-01
dc.identifier.uri https://repository.maseno.ac.ke/handle/123456789/1521
dc.description 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 … en_US
dc.description.abstract 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. en_US
dc.publisher Elsevier en_US
dc.subject C-DDTMineralizationAnaerobic-aerobic cyclingDFT calculation en_US
dc.title Shorter interval and multiple flooding-drying cycling enhanced the mineralization of 14C-DDT in a paddy soil en_US
dc.type Article en_US


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