Ferrous ions accelerate sulfide-induced abiotic dechlorination of DDT in waterlogged paddy soil and in soil solution
Ba, Yu-Xin ; Hu, Zheng-Yi ; Bao, Peng ; Qiao, Min ; Hua, Jing ; Wu, Chun-Yan ; Wu, Jian-Zhi
刊名JOURNAL OF SOILS AND SEDIMENTS
2011-10-01
卷号11期号:7页码:1209—1220
中文摘要Abiotic dechlorination of organochlorine pollutants seems to occur more efficiently in nature than previously thought. Ferrous (Fe(2+)) and sulfide (S(2-)) ions have been shown to be effective dechlorinating reagents. However, little is known about the interactions between Fe(2+) and S(2-) during dechlorination of 1,1,1-trichoro-2,2-bis(p-chlorophenyl)-ethane (DDT) in soil, in spite of the fact that these ions co-exist in waterlogged soils. An anaerobic soil incubation experiment was run for 192 h to investigate S(2-) (1.0, 10 mM)-induced abiotic dechlorination of p,p'-DDT in waterlogged soil (soil/water = 1/20). In addition, the influence of Fe(2+) (3.0 mM) on S(2-) (0.5, 5.0 mM)-induced abiotic dechlorination of p,p'-DDT (2 mu g ml(-1)) was evaluated in soil solution and in distilled deionized water to identify the dechlorination mechanism under anaerobic incubation conditions for 6 h due to the complexity of soil, based on the determination of residual p,p'-DDT in media by gas chromatograph (GC)-ECD and the identification of metabolites of p,p'-DDT by GC-MSD. S(2-)-induced dechlorination of p,p'-DDT exhibited rapid and slow phases in three media (waterlogged soil, soil solution, and distilled deionized water). The addition of Fe(2+) significantly accelerated S(2-)-induced dechlorination, reduced the remaining concentrations of p,p'-DDT at the turning point and the end point for the dechlorination reaction, and shortened the time to reach equilibrium in two aqueous media. In all, 93% and 48% of p,p'-DDT was dechlorinated in soils supplied with 1.0 and 10 mM S (,) (2-) respectively. The underlying mechanism can be attributed to the coupling effect of Fe(2+) and S(2-) on dechlorination of DDT since the rates of dechlorination of p,p'-DDT treated by 0.5 and 5.0 mM S(2-) over 6 h were significantly greater with Fe(2+) addition than without Fe(2+) addition in aqueous phase media. The metabolites of p,p'-DDT found in the three media were identified as p,p'-DDD, p,p'-DDE, and p,p'-DDMU, with or without the addition of Fe(2+). Combined Fe(2+)/S(2-)-induced dechlorination of DDT could be important for in situ remediation of DDT-contaminated soil/sediment given that Fe(2+) and S(2-) often co-exist in anaerobic conditions.
公开日期2012-10-15
内容类型期刊论文
源URL[http://ir.rcees.ac.cn/handle/311016/7001]  
专题生态环境研究中心_土壤环境科学实验室
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GB/T 7714
Ba, Yu-Xin,Hu, Zheng-Yi,Bao, Peng,et al. Ferrous ions accelerate sulfide-induced abiotic dechlorination of DDT in waterlogged paddy soil and in soil solution[J]. JOURNAL OF SOILS AND SEDIMENTS,2011,11(7):1209—1220.
APA Ba, Yu-Xin.,Hu, Zheng-Yi.,Bao, Peng.,Qiao, Min.,Hua, Jing.,...&Wu, Jian-Zhi.(2011).Ferrous ions accelerate sulfide-induced abiotic dechlorination of DDT in waterlogged paddy soil and in soil solution.JOURNAL OF SOILS AND SEDIMENTS,11(7),1209—1220.
MLA Ba, Yu-Xin,et al."Ferrous ions accelerate sulfide-induced abiotic dechlorination of DDT in waterlogged paddy soil and in soil solution".JOURNAL OF SOILS AND SEDIMENTS 11.7(2011):1209—1220.
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