海南岛砖红壤中重金属环境质量评价

Environmental Quality Assessment of Heavy Metal in Latosol in Hainan Island

以海南岛砖红壤调查资料为基础,分析砖红壤中重金属元素的含量分布特征,并利用地质累积指数法与内梅罗综合污染指数法对海南岛砖红壤中重金属污染状况进行评价.结果表明,由地质累积指数可知:Cr、Zn、Pb元素属于无污染到轻污染程度阶段,其中Cr元素接近轻污染水平;Ni、Cd元素属于轻污染水平;Cu、As元素处于轻污染到重污染阶段.以南方砖红壤背景值作为评价标准,发现Cd元素在研究区域已经达到重污染水平;Ni元素没有造成土壤污染,Cr、Cu、Zn、As、Pb元素在研究区域内达到了轻度污染水平;7种重金属污染元素的污染指数大小顺序为Cd>Pb>Zn>Cu>As>Cr>Ni.采用土壤环境质量标准,显示海南砖红壤中大部分重金属元素达到国家二级标准,但个别元素在个别区域处于轻度污染水平;有些地区土壤虽未受到污染,但一些重金属元素达到警戒值,应引起重视.

In this thesis,a series of samples collected during the survey in latosol in Hainan island are analyzed to reveal the content distribution of heavy metals.And by use of Geoaccumulation and N.L.Nemerow,the pollution of heavy metal in latosol were evaluated.Through the geological cumulative index we can know,Cr,Zn,Pb elements are in pollution-free to light pollution degree phase,Among them Cr element is close to light pollution levels;Ni,Cd elements are in light pollution levels;Cu,As elements are in light pollution to heavy pollution stage.Using the latosol background value as evaluation standard,it was found that Cd elements in the study area has reached the level of heavy pollution,Ni element does not cause soil pollution,Cr,Cu,Zn,As,Pb elements reached a level of light pollution in study area;Pollution index of 7 kinds of heavy metal was in the order of CdPbZnCuAsCrNi.Using soil environmental quality standards,found most of the heavy metal element were found to reach the national secondary standard,but individual elements in separate areas reach light pollution levels.In some areas the soil is not polluted,however,some heavy metals reach the warning value,These areas should be paid attention to.