受酸性矿山废水影响河流悬浮物中重金属污染特征分析与生态风险评价

发布时间：2017-12-31 20:26

本文关键词：受酸性矿山废水影响河流悬浮物中重金属污染特征分析与生态风险评价　出处：《环境化学》2016年11期 　论文类型：期刊论文

【摘要】：受酸性矿山废水影响河流水体与沉积物中重金属污染及评价的研究已有大量报道,而缺乏对这类水体悬浮物重金属污染研究.选择受广东大宝山采矿废水影响的横石河为研究对象,研究该河流悬浮物中6种重金属元素(Mn、Cu、Zn、As、Cd和Pb)的浓度空间分布,采用地累积指数法和潜在生态危害指数法评价重金属生态风险,结合悬浮物组分SEM/XRD表征来进一步解析污染特征及迁移转化机理.结果表明,横石河悬浮物重金属污染严重,主要来源于大宝山采矿废水,Mn、Cu、Zn、As、Cd、Pb起始浓度分别高达1470、101.6、12169、174.9、412.2、873.7 mg·kg~(-1),且重金属浓度沿程呈逐渐降低趋势,与悬浮物含量呈显著正相关;悬浮物中重金属污染处于极强风险等级,单个元素Cd严重污染频率为83.33%,对RI贡献平均超90%,各元素潜在风险大小为:CdZnAsPbCuMn;横石河悬浮物初始矿物成分以施氏矿物为主,随着河流的迁移,其逐渐向更为稳定的针铁矿和水铁矿转化,这种矿物组成及转化决定了重金属的分布特征.
[Abstract]:The study of heavy metal pollution and evaluation in river water and sediment affected by acid mine wastewater has been reported. However, the research on heavy metal pollution of suspended matter in this kind of water is lacking. The Hengshi River, which is affected by mining wastewater in Dabaoshan, Guangdong Province, is selected as the research object to study six heavy metal elements in the suspended matter of this river. The spatial distribution of the concentration of CD and Pb) was evaluated by the method of ground accumulation index and potential ecological hazard index. The pollution characteristics and migration and transformation mechanism were further analyzed by means of SEM/XRD characterization of suspended solids. The results showed that the heavy metal pollution of suspended solids in Hengshi River was serious and mainly originated from mn in Dabaoshan mining wastewater. The initial concentration of Pb in Aspergillus aspergillata was as high as 1470 ~ 101.6U ~ 12164.9 ~ 174.9N ~ (412.2N) ~ 873.7 mg 路kg ~ (-1) ~ (-1). The concentration of heavy metals decreased gradually along the course, and there was a significant positive correlation with the content of suspended solids. Heavy metal pollution in suspended solids is in a very strong risk level. The frequency of CD serious pollution of single element is 83.33, and the contribution to RI is more than 90% on average. The potential risk of each element is: 1. CdZnAsPbCuMn. The initial mineral composition of the suspended matter in the Hengshihe River is dominated by Schwann minerals. With the migration of the river, it gradually transforms to the more stable goethite and hydropyrite, which determines the distribution characteristics of heavy metals.
【作者单位】：北京理工大学珠海学院材料与环境学院;北京师范大学珠海分校工程技术学院;
【基金】：广东省创新强校工程基金(831783) 十二五科技支撑计划项目(2015BAK11B03) 北京理工大学珠海学院质量工程建设项目(2016003ZL)资助~~
【分类号】：X751;X522;X826
【正文快照】： Supported by Fund for InnovationStrong School Engineering of Guangdong Province(831783),Technology ResearchDevelopmentProgram During the 12th Five-Year Plan Period(2015BAK11B03)and the Quality Engineering Project of ZHBIT(2016003ZL).**通讯联系人,Tel:13

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