浏阳河底泥中重金属释放污染水体研究  

Study on the Release and Pollution of Heavy Metals in Liuyang River Sediments

作　　者：李荣喜[1] 雷敏[1] 余取民[1] 杨珊[1] 刘迎新[1] 陈圆华[1] 

机构地区：[1]长沙学院生物工程与环境科学系,长沙410003

出　　处：《工业安全与环保》2014年第3期69-72,共4页Industrial Safety and Environmental Protection

基　　金：长沙市科技局科技计划项目(K110710-31);湖南省科技厅科技计划项目(2011sk3113);湖南省重点建设学科资助项目

摘　　要：浏阳河底泥中的富集重金属的底泥会以一定形态进行二次释放。主要考察了时间、pH值、温度以及分别固定Cl-、NO-3、SO2-4的条件下常见阳离子Na+和Mg2+等因素对底泥中重金属Cd、Cr、Pb、Ni释放的影响。结果显示:①通过底泥中重金属总含量的测定,发现重金属污染程度为Cd>Pb>Cu>Ni;同时Cd对浏阳河的潜在生态危害程度评价等级为强,其他3种重金属则属于轻微生态危害;②重金属Cd和Pb释放比较明显,Ni和Cu释放量未检测出;底泥中重金属的释放量随着时间、温度、阴离子浓度的增加而增大,除pH值在一定范围内对释放量的影响呈凹形趋势;③Cl-、NO-3、SO2-4浓度一定时,Mg2+对重金属释放量的提升作用明显大于Na+;相同浓度时,对Cd和Pb释放影响较大的是Cl-和SO2-4。The heavy metals in the sediment of Liuyang River will be released to the environment and bring the second pol lution. Effects on the heavy metals release are studied, such as time, pH, temperature and the commonly - seen Na ＋ and Mg^2^ when concentrations of CI- ,NO3- and SO^24- are certain. The results show that ： ① the contamination sequence for heavy metals is Cd 〉 Pb 〉 Cu 〉 Ni, meanwhile the potential ecological risk factor of Cd is highest and others are in lower pollution degree;②the release of Cd and Pb is obvious, but Ni and Cu can＇ t be seen and tested; with the increase of time, temperature and anion concentration, the release of heavy metals incREasas and except pH, it tends to low in middle and higher in early and hte;③the influence of Mg^2＋ on the release of heavy metals is obviously larger than that of Na ＋ when concentrations of CI-, NO3- and SO^24- are certain; and Ci- and SO^24- has a larger influence on Cd and Pb when the con centrations are the same.

关 键 词：浏阳河底泥 重金属污染 释放 

分 类 号：X52[环境科学与工程—环境工程]