连二亚硫酸钠对淹水土壤中p,p'-DDT 脱氯过程的影响及机理研究

doi:10.7523/j.issn.2095-6134.2012.2.009

摘要/Abstract

摘要：

在淹水培养条件下(土/水=2 g/40 mL),研究连二亚硫酸钠(200 mmol/L Na₂S₂O₄)对p,p'-DDT在自然土和Na₂S₂O₄还原土壤中降解历程的影响及机理. 在自然土和还原土中添加Na₂S₂O₄促进p,p'-DDT降解,2 d降解率分别为73%和79%,随后降解缓慢. p,p'-DDT在土壤中降解为p,p'-DDD和p,p'-DDE. p,p'-DDT主要被Na₂S₂O₄降解,Na₂S₂O₄还原土壤产生的Fe²⁺也有贡献. Na₂S₂O₄与Fe²⁺体系对修复DDTs污染土壤有应用前景.

关键词: DDT, 硫, 非生物脱氯, 水稻土, 亚铁离子

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

中图分类号:

华晶, 胡正义, 鲍鹏, 巴玉鑫, 吴春艳. 连二亚硫酸钠对淹水土壤中p,p'-DDT 脱氯过程的影响及机理研究[J]. 中国科学院大学学报, 2012, (2): 206-211.

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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