乌梁素海表层水中重金属元素的空间分布及生态风险评估

摘要

于2014年4月采集乌梁素海表层水样,利用地统计方法分析重金属元素Cd、Cr、Cu、Hg、Pb、Zn的空间分布特征,并通过计算元素的富集系数来分析其富集水平.结果表明:重金属元素具有相似的空间分布特征,除局部区域外均呈现出随水流方向从北到南递减的趋势,Cu在局部区域存在高值区,Pb在水流经10号采样点后质量浓度逐渐升高.元素的富集系数从高到低依次为Hg>Cd>Cu>Zn>Cr>Pb,其中Hg富集非常明显,达到高等富集和很高富集水平,Cd在4号采样点达到中等富集水平,其他元素为不足最小富集水平.%This paper analysed the spatial distribution characteristics of heavy metals such as Cd , Cr, Cu, Hg, Pb and Zn in the surface water of Ulansuhai Lake in April 2014 by statistical method , and the elements en-richment level by calculating the enrichment coefficient .The results showed that heavy metal elements in the whole lake had similar spatial distribution characteristics .Besides some local area of the lake , it decreased from north to south along with the water flow .Cu had a high value in some areas , the concentration of Pb increased after water pass through No .10 sampling point .The descending order of the element enrichment coefficient was Hg>Cd>Cu>Zn>Cr>Pb.Hg enriched obviously , which reached to high and higher enrichment level .Cd reached to middle enrichment level at No .4 sampling point , other elements were not enough to the minimum lev-el of enrichment .