太子河本溪城区段河流重金属空间分布及风险分析

发布时间：2018-04-14 16:22

  本文选题：重金属 + 空间分布　； 参考：《辽宁大学》2017年硕士论文

【摘要】：太子河是辽宁省境内的主要河流之一,流经本溪、营口、鞍山和辽阳等城市,为流经地区人们日常生活、生产提供了水源。尤其是太子河本溪城区段,长期以来,太子河本溪城区段周围的工厂和本溪市居民产生了大量的工业废水和生活污水,这些废水大部分都排入了太子河,使太子河水体及表层沉积物都遭受了严重的污染。为此,开展太子河本溪城区段河流重金属的空间分布及风险分析十分有必要。本研究进行了太子河本溪城区段水体重金属含量的空间分布研究和综合污染进行分析。结果可知,下游采样点的重金属含量普遍比上游采样点的重金属含量高,大部分采样点中的重金属含量均低于国家地表水三类标准。应用PHREEQC软件对As,Cu,Zn,Pb,Cd在水体中的存在形态进行了模拟。由模拟结果分析可知,太子河本溪城区段水体中的Cu主要以CuCl2-、CuCl32-、Cu(OH)2和CuCO3这四种形式存在;Zn的主要存在形态为Zn2+、Zn(OH)2、ZnCO3、ZnSO4;Pb主要存在形态为PbCO3、Pb2+、PbOH+、PbSO4;Cd的主要存在形态为CdCl+、Cd2+、CdCl2、CdSO4;As主要存在形态为HAsO42-和H2AsO4-。通过对太子河本溪城区段河流表层沉积物中重金属的污染程度进行评价,得出其污染程度依次为:CdFeZnCr≈Mn≈NiCu≈Pb。利用潜在生态危害指数法对太子河本溪城区段除Fe以外的其他七种重金属进行评价分析,评价结果为,太子河本溪城区段的河流表层沉积物重金属具有很强的潜在生态危害性,其主要污染物为Cd元素,应对各个采样点均加以防御。分别对太子河本溪城区段河流表层沉积物中的八种重金属进行了相关性分析和聚类分析,分析结果表明,太子河本溪城区段河流表层沉积物重金属中Pb、Cd和Mn三种重金属具有一定的同源性;Cu与Pb、和Cd三种重金属也具有较好的同源性。
[Abstract]:Princeling River is one of the main rivers in Liaoning Province, which flows through Benxi, Yingkou, Anshan and Liaoyang cities.In particular, for a long time, the factories around the Benxi section of the princeling River and the residents of Benxi City produced a large amount of industrial and domestic sewage, most of which was discharged into the princeling River.The water body and surface sediment of the princeling River are seriously polluted.Therefore, it is necessary to analyze the spatial distribution and risk of heavy metals in Benxi section of Taizi River.In this study, the spatial distribution of heavy metals in Benxi section of Taizi River was studied and the comprehensive pollution was analyzed.The results show that the heavy metal content in the downstream sampling sites is generally higher than that in the upstream sampling sites, and the heavy metal contents in most of the sampling sites are lower than the national surface water standards.In this paper, PHREEQC software was used to simulate the forms of CD and CD in water.According to the analysis of simulation results,By evaluating the pollution degree of heavy metals in the surface sediments of Benxi section of Taizi River, it is found that the pollution degree of heavy metals is in the order of: CdFeZnCr 鈮，

本文编号：1750112