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酸性淋溶对铅锌尾矿金属行为的影响及植物毒性
引用本文:蓝崇钰,束文圣,张志权.酸性淋溶对铅锌尾矿金属行为的影响及植物毒性[J].中国环境科学,1996,16(6):0-0.
作者姓名:蓝崇钰  束文圣  张志权
作者单位:中山大学生命科学学院
基金项目:国家自然科学基金,广东省自然科学基金
摘    要: 露天存放的铅锌尾矿受到自身酸化和酸雨的双重影响,从而加剧尾矿对环境的影响。因此,研究尾矿在酸性条件下的重金属行为及其植物毒性,对植物在铅锌尾矿地的自然定居有非常重要的意义。将铅锌尾矿砂装柱,用pH2~7溶液淋溶50天的结果表明,酸度的提高可以显著地增加尾矿砂中重金属(Pb、Zn、Cu和Cd)的溶出。而随着时间的延长,Zn的溶出量明显增高,Pb和Cu的溶出则逐渐降低。在pH值<3时,Cd的溶出逐渐升高,pH值>3时,Cd的溶出也呈下降趋势。酸度对重金属溶出的影响由大至小依次为Zn>Cd>Cu>Pb。渗滤液对植物的毒性随着起始淋溶酸度的提高与时间的推移而加剧

关 键 词:铅锌尾矿  酸性淋溶  重金属  植物毒性
收稿时间:1900-01-01;

Effects of acid leaching on heavy metals mobility of Pb/Zn tailings and the phyto toxicity of leachate
Lan Chongyu,Shu Wensheng and Zhang Zhiquan School of Life Sciences,Zhongshan University,Guangzhou.Effects of acid leaching on heavy metals mobility of Pb/Zn tailings and the phyto toxicity of leachate[J].China Environmental Science,1996,16(6):0-0.
Authors:Lan Chongyu  Shu Wensheng and Zhang Zhiquan School of Life Sciences  Zhongshan University  Guangzhou
Institution:Lan Chongyu,Shu Wensheng and Zhang Zhiquan School of Life Sciences,Zhongshan University,Guangzhou 510275
Abstract:In order to understand the effects of acid rain and self acidification of Pb/Zn tailings on the phyto toxicity of the open stored tailings,acid leaching tests of Pb/Zn tailings were undertaken for 50 days.Solutions of different pH values (varied from 2 to 7)were used for leaching the Pb/Zn tailings stacked in PVC columns. The results indicated that acid leaching could increase the released amount of heavy metals. Generally, Pb and Cu contents in leachate decreased significantly with leaching time but that of Zn increased. When pH<3, Cd contents of leachate were increased with leaching time but decrease when pH>3.The mobility of Zn was the most sensitive to leaching solution acidity,then Cd,Cu and Pb in turn.The phyto toxicity of the leachate was enhanced as the duration and initial acidity of the leaching were increased.
Keywords:Pb/Zn tailings  acid leaching  heavy metals  phyto  toxicity  
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