铜绿山矿尾砂重金属与磁化率特征及环境评价  

Characteristics of Heavy Metals and Magnetic Susceptibility of Mine Tailings and Environmental Assessment in the Tonglvshan Mine Area

作　　者：王秋潇[1,2] 谢淑云[2,3] 黄康俊[1,2] 鲍征宇[2,3] 

机构地区：[1]中国地质大学研究生院,湖北武汉430074 [2]中国地质大学地球科学学院,湖北武汉430074 [3]中国地质大学地质过程与矿产资源国家重点实验室,湖北武汉430074

出　　处：《环境科学与技术》2009年第B12期1-7,共7页Environmental Science & Technology

基　　金：国家自然科学基金联合资助（40872195和40502029）致谢在样品的制备与测试分析阶段.得到了中国地质大学（武汉）地质过程与矿产资源国家重点实验室的陈海红老师、张春来同学的热心帮助,鄂东南地质大队在野外考察、资料收集等方面给予了大力支持,在此一并表示感谢.

摘　　要：通过对铜绿山矿尾砂剖面的研究，结果表明强烈的风化作用使得磁化率在重金属含量出现最小值之处反而达到较大值，而下渗作用使得磁化率随剖面深度的增加而增大并在剖面最底层达到最大值。分析显示：重金属与磁化率之间并不存在显著正相关性，但两者均具有较高数值．磁化率的升高可能与某些含铁矿物的富集有很大关系。5种重金属元素在向水系沉积物中迁移时，含量的最高值均来出现在污染源头——水覆尾砂中．而是出现在元素迁移过程中的某些地点。由于受到其它人为作用的影响，重金属在水稻土中的含量分布比较复杂。对比在上述三种环境介质中的含量分布，五种重金属分别具有“释放”、“吸附”或“混合”特征，其各自在污染防控工作中的重心各有不同。重金属潜在生态危害评价认为：对该区环境影响最为严重的是CA，Cu次之，而Pb、Zn、Cr的危害程度都很小。综合来看，水稻土可能已受到中等生态危害，而水系沉积物受到的生态危害最为严重，达到了强和很强的程度。The study of the tailing profile of Tonglvshan Mine shows that strong weathering can make the magnetic susceptibility higher at some place where the capacity of heavy metals reaches the lowest. The deeper the sampling site is, the higher the magnetic susceptibility becomes. Furthermore, the magnetic susceptibility is up to the highest at the bottom of the tailing profile. The analysis shows that there is no marked direct proportion between the five heavy metals of study and the magnetic susceptibility, but both of them have high values. The high value of the magnetic susceptibility probably has a relationship with the richment of some iron-minerals. The highest values of the five heavy metals do not appear in the water covered tailings, but occur in some places where the elements migrate. Because of the influence of artificial effects, the distribution of heavy metals in the soil becomes more complicated. Compared with the contents of heavy metals in the three environmental media discussed above, the five heavy metals can be classified into three types：＂Releasing Type＂,＂Adsorption Type＂ and＂Mixture Type＂. Accordingly, different kinds of measures should be taken to control the contamination of these heavy metals. Heavy metal pollution evaluation of potential ecological risk shows that the environment in this area is strongly affected by Cd and Cu, but much more weakly by Pb,Zn and Cr. Therefore, the soil may have polluted at the level of medium ecological harm, while the ecological harm degrees of stream sediments are most serious.

关 键 词：重金属 磁化率 环境评价 铜绿山 

分 类 号：X753[环境科学与工程—环境工程]