Position: Home > Articles > Column Leaching of Pb and Zn in Co-Contaminated Sandy Soils by N-LED3A
Journal of Anhui Agricultural Sciences
2018
(32)
116-119+127
N-LED3A对Pb-Zn复合污染砂土柱淋洗效果的影响
作 者：
乔洪涛;赵保卫;范建凤;郑庆荣
单 位：
兰州交通大学环境与市政学院;忻州师范学院地理系;忻州师范学院化学系
关键词：
N-十二酰基乙二胺三乙酸钠盐;土柱淋洗;重金属;BCR提取法;土壤修复
摘 要：
[目的]研究N-LED3A对Pb-Zn复合污染砂土柱淋洗效果的影响。[方法]采用土柱淋洗法研究了新型螯合型表面活性剂N-十二酰基乙二胺三乙酸钠盐(N-LED3A)对Pb-Zn复合污染砂土的柱淋洗,考察了淋洗速度对淋洗效果的影响以及淋洗前后重金属Pb、Zn的形态变化特征。[结果]不同淋洗速度条件下N-LED3A对Pb、Zn的淋洗曲线具有相似的规律,即淋出液中Pb、Zn的浓度随淋洗液累积孔隙体积数的增大而呈现急剧增大、达到峰值以及急剧减小后在低浓度条件下趋于平缓;随着淋洗速度从5.0 cm/h增加到14.1 cm/h,N-LED3A对Pb、Zn的去除率分别减少8.8%和10.1%。不同淋洗速度下土柱中不同深度处酸可提取态Pb、Zn的去除率最大,淋洗速度和淋洗深度对氧化物结合态、有机结合态和残余态Pb、Zn的影响规律不同。[结论]低流速淋洗能够有效降低污染土壤中Pb、Zn的环境风险。
译 名：
Column Leaching of Pb and Zn in Co-Contaminated Sandy Soils by N-LED3A
作 者：
QIAO Hong-tao;ZHAO Bao-wei;FAN Jian-feng;Department of Chemistry,Xinzhou Teachers University;School of Environmental and Municipal Engineering,Lanzhou Jiaotong University;
单 位：
QIAO Hong-tao%ZHAO Bao-wei%FAN Jian-feng%Department of Chemistry,Xinzhou Teachers University%School of Environmental and Municipal Engineering,Lanzhou Jiaotong University
关键词：
Sodium N-lauroyl ethylenediamine triacetate;;Column leaching;;Heavy metals;;BCR continuous extraction;;Soil remediation
摘 要：
[Objective]To study column leaching of Pb and Zn in co-contaminated sandy soils by N-LED3 A.[Method]In the present study,laboratory column leaching experiments were conducted to investigate performance of leaching Pb and Zn in co-contaminated sandy soil by a novel chelating surfactant,sodium N-lauroyl ethylenediamine triacetate( N-LED3 A).The influences of leaching rates on leaching efficiency and changes of metals speciations in the soil before and after N-LED3 A leaching were investigated.[Result]The leaching law of Pb and Zn by N-LED3 A were basically similar under different leaching rates. The concentrations of Pb and Zn in leacheate increased,achieved maximum and then decreased with the cumulative pore volume numbers of leaching solutions.As the leaching rates increased from 5.0 to 14.1 cm/h,the leached percentages of Pb and Zn by N-LED3 A was reduced by 8.8% and 10.1%,respectively.By analyzing the data of metal speciation before and after leaching,the removal efficiencies of acid extractable fraction Pb and Zn were the highest.The effects of leaching rate and leaching depth on reducible,oxidizable,and residual fraction were different.[Conclusion]Low flow rate leaching can effectively reduce the environmental risk of Pb and Zn in contaminated soil.
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