Dechlorination process and mechanism of p,p'-DDT in waterlogged soils by dithionite

doi:10.7523/j.issn.2095-6134.2012.2.009

Abstract

Abstract:

Dechlorination process and mechanism of p,p'-DDT in soil and dithionite-treated soil by dithionite (200 mmol/L) were investigated under waterlogged culture condition (soil/water=2 g/40 mL). Addition of dithionite resulted in dechlorination of p,p'-DDT by 73% and 79% for 2 d in soil and dithionite-treated soil, respectively, and subsequently the dechlorination slowly continued. The p,p'-DDD and p,p'-DDE were identified to be metabolites of p,p'-DDT in dithionite-treated soil. The dithionite was the predominant contributor of dechlorination of p,p'-DDT, and Fe²⁺ in dithionite-treated soil also had contribution. Dithionite could be used to develop a remediation option for DDTs-contaminated soils.

Key words: DDT, sulfur, abiotic dechlorination, paddy soil, Ferrous

CLC Number:

HUA Jing, HU Zheng-Yi, BAO Peng, BA Yu-Xin, WU Chun-Yan. Dechlorination process and mechanism of p,p'-DDT in waterlogged soils by dithionite[J]. , 2012, (2): 206-211.

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