The Pollution Analysis Of Heavy Metals And Transformation Of Heavy Metal Insediment Of Nansha River And Liangshui River

The research of this essay is focused on Nansha River(River of Liao River Basin) and Liangshui River (River of Haihe River Basin). The pollution characteristics of heavy metal in water,suspended solid and surface sediments had been analysed. Index of geo-accumulation and potential ecological risk of heavy metals in surface sediment was assessed by the method of potential ecological risk index. This research shows the rule of adsorption about the heavy metal, and factor analysis was choosed to calculate the source apportionment of contaminants in Nansha River. Those provides scientific basis for the control and treatment of Rivers. The followings are conclusions:(1) Distribution characteristics of 16 kinds of heavy metals in water during three seasons and suspended solids and surface sediment of Nansha River during dry seasons were studied. Referring to《Environmental quality standards for surface water GB3838-2002》, Cd,As,Cu and Se were better than Grade I,and in some sections Pb was worse than GradeⅣand Zn was worse than GradeⅢ.Compared to soil background values of Liaoning Province, There were some accumulations of Cd,Zn in suspended solids during dry season. And There were significant accumulations of As,Se,Cd,Sb,Tl,Pb,Zn,Cu,Mn,Fe,Mg and Al in surface sediments.(2) Distribution characteristics of 16 kinds of heavy metals in water and suspended solids and surface sediment of Liangshui River in flood periods and non-flood periods were studied. As,Se were better than GradeⅠ,and Cu,Cd fit GradeⅡ. The content of Pb was over Grade IV in some sections, and the content of Zn conformed GradeⅢin most sections. Compared to soil background values of Beijing, There were obvious accumulations of As,Se,Cd,Sb,Pb,Zn,Cu,Ba in suspended solids during flood periods. There were significant accumulations of Cr,Ni,As,Se,Cd,Pb,Zn,Cu in suspended solids during non-flood periods. There were apparent accumulations of As,Se,Cd,Sb,Cr,Pb,Zn,Cu,Ca,Fe,Mg,Ni in surface sediments.(3) Six toxic heavy metals with high concentration were selected to evaluate, and Index of geo-accumulation and potential ecological risk of heavy metals in sediment was assessed by the method of potential ecological risk index. Results indicated:Igeo classify are between 0-3, and the contamination levels are from non to middle, and potential ecological risk of heavy metals in sediment exhibits light to middle, with Cd as priority risk in two rivers. Various heavy metals pollution degree from high to low is:Zn>As>Pb>Cu>Cr>Cd in Nansha River.Various heavy metals pollution degree from high to low is:Zn>Cu>Cr>Pb>As>Cd in Liangshui River.(4) Factor analysis was choosed to calculate the source apportionment of contaminants in Nansha River. The result shows that the pollution source of Heavy Metal in Nansha River can be divided into three types:metallurgy and forge, ore mining and coal burning.The contributions of the three source respectively is:58.609%,15.375%,9.854%; for the pollution source apportionment of the sediments, it respectively is: 36.691%,22.037%,36.255%.(5) Sediment adsorbing Pb can be better fitted by "L" "F"isotherm.As temperature increased, sediments absorbed more Pb2+,with the salinity vslue increased, Pb2+absorbed in sediments went up. and as pH increased, sediments absorbed more Pb2+...