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冻融对污染场地土壤重金属稳定化性能的影响

丛 鑫 王 森 张 琢 王 梅 宋鑫莱 陈家煜 郭观林

丛 鑫, 王 森, 张 琢, 王 梅, 宋鑫莱, 陈家煜, 郭观林. 冻融对污染场地土壤重金属稳定化性能的影响[J]. 环境科学研究, 2015, 28(8): 1240-1245.
引用本文: 丛 鑫, 王 森, 张 琢, 王 梅, 宋鑫莱, 陈家煜, 郭观林. 冻融对污染场地土壤重金属稳定化性能的影响[J]. 环境科学研究, 2015, 28(8): 1240-1245.
CONG Xin, WANG Sen, ZHANG Zhuo, WANG Mei, SONG Xinlai, CHEN Jiayu, GUO Guanlin. Effects of Freeze-Thaw Cycle on Stabilization Performance of Heavy Metals in Soil of Contaminated Site[J]. Research of Environmental Sciences, 2015, 28(8): 1240-1245.
Citation: CONG Xin, WANG Sen, ZHANG Zhuo, WANG Mei, SONG Xinlai, CHEN Jiayu, GUO Guanlin. Effects of Freeze-Thaw Cycle on Stabilization Performance of Heavy Metals in Soil of Contaminated Site[J]. Research of Environmental Sciences, 2015, 28(8): 1240-1245.

冻融对污染场地土壤重金属稳定化性能的影响

基金项目: 国家高技术研究发展计划(863)项目(2013AA06A206);国家自然科学基金青年科学基金项目(41403100)

Effects of Freeze-Thaw Cycle on Stabilization Performance of Heavy Metals in Soil of Contaminated Site

  • 摘要: 为了分析冻融对污染场地土壤重金属稳定化性能的影响,采用赤泥和硫化钠作为添加剂,对土壤中的Pb、Zn和Cd进行稳定化处理,并通过模拟冻融过程,分析冻融循环后重金属的浸出毒性、生物可给性、土壤pH和土壤结构的变化,探讨冻融循环对稳定化处理土壤中重金属长期稳定性能的影响. 结果表明:稳定化处理后土壤中Pb、Zn和Cd的浸出毒性比原始供试土壤分别降低了98.5%、99.8%和99.7%. 养护30 d后,稳定化处理土壤中Zn和Cd的生物可给性分别由28.8%、49.5%降至11.5%、21.8%,Pb的生物可给性由52.9%升至57.9%. 经过30 d冻融循环后,冻融土壤中Pb、Zn和Cd的浸出毒性比原始供试土壤中相应重金属质量分数分别增加了4.27、2.47、89.65 mg/L. 经过冻融循环后,土壤中重金属的生物可给性比未冻融土壤略有升高. 随着养护时间和冻融时间的延长,土壤pH呈升高趋势. 不同阶段土壤扫描电镜结果显示,冻融循环致使土壤空隙变大、结构松散,说明冻融循环对稳定化土壤结构有一定损伤. 分析结果表明,冻融过程增加了Pb、Zn和Cd释放的环境风险.

     

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  • 刊出日期:  2015-08-25

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