Tracing Source And Distribution Of Heavy Metals In Soil Using Lead Isotopes, Panzhihua, China

Soil is the material basis for human survival,which take an important role in theecological environment.Through the soil-plant-human system migration, the heavymetal elements of soil will concentration in the body, and endanger human life.Lead tohumans are extremely harmful effects.PanZhihua, located in the Yangtze river upstreamYangtze river section,which is a typical mining city,have problem on live environment.So findingthe source of environmental pollution is imminent.There are three kind of methods to find out pollution sources: elementgeochemical statistical method, plane figure method and isotope tracer method.Theformer two methods mainly amount of trace elements in the soil and quality evaluation.Some scholar use illustrating to find out the source of different heavy metal distribution.The isotope tracer analysis is one of the most effective methods to find out the of heavymetal pollution source in soil. This is because the Pb isotope no radioactive in samplecollection, and it will not be decomposed by samplecollection、samplepreconcentration and sample test.and at the same time it can track generation and themigration of pollutants in the transformation process.Tracing source pollution by Pbisotopes is in the stage of exploration, and the tracer study of panzhihua mineenvironmental heavy metal pollution source is not reported.Panzhihua district in the soil, different heavy metals planar distribution, profiledistribution of different, the variation coefficient difference is bigger, at the same time,the soil quality grade difference is bigger also. Coefficient of variation range of46.26%~90.48%, but the correlation between elements is better. Especially with Pb and Cdelement correlation is most obvious, Pb and Cd are common sources of pollution.Panzhihua industrial zone, vanadium products factory, the door of the river power plantas well as the west end slag domain in jobsite, the Pb variation coefficient was78.65%,the highest minimum coefficient of variation is49.23%. The Cd the variationcoefficient was95.07%, minimum42%. Show panzhihua four research areas of Pb andCd source are more complex. Panzhihua characteristic section of heavy metal elementin different areas is different, but Pd and Cd elements are present a similar distributionfeatures: overall lower element content with soil depth increase. Panzhihua in differentsoil heavy metals pollution levels, Pb and Cd element in the study area were~is strongin the pollution. Because PanZhihua is a typical mining city, it is advanced atmetallurgical industry, building materials industry and energy industry.So it is seriousin environmental pollution.In my study,I will analysis the source of Pb by using some geochemical analysis methods. Analysis the correlation of Pb and Cd,and use the method of Pb isotopetracing source to establish hybrid model of multivariate pollution source.And calculateis the percentage composition of different pollution source.In binary mixture model, combineding with the geochemical methods of statisticalanalysis and element plane for figure to determine Pb and Cd have the commonpollutant source. Ratio-1/elements determine that only west slag field accord withbinary pollutant mixed model. ratio-ratio determine that the west slag fields’mainpollutant source is coal and automobile exhaust. According to the law of conservationof quality, the lead isotopic of coal accounted for57.89%, and the lead isotopic ofvehicle exhaust (gasoline lead) accounted for42.11%.In ternary hybrid model, combineding with the geochemical methods of statisticalanalysis, and element plane for figure, to determine that the PanZhihua Industrial area,Vanadium Products Factory and the Electric factory have three pollutant source. Ratio-ratio-ratio, combineding with the law of conservation of quality, determine thatdifferent zone have different pollutant source. Results are as follows:PanZhihuaIndustrial area: coal accounted for9.8%, automobile exhaust accounted for36.75%,slag accounted for53.45%;Vanadium ProductsFactory: coal accounted for10.35%,automobile exhaust accounted for82.76%, slag accounted for6.89%;Electric factory:coal accounted for52.21, automobile exhaust accounted for37.98%, slag accounted for9.81%.