Research On Geochemical Background And Flux For Cadmium, Mercury And Lead In Soil Environment In The Piedmont Region Of Taihang Mountain

With the continuous economic development, environmental issues have become increasingly prominent. So the prevention of soil pollution is an important topic and task, which the government and scientists have to be focused on. The determination of the geochemical background and flux of heavy metal in an area is not only an important basis for judging the degree of pollution, but also important scientific basis for the prevention of the soil pollution.On the basis of multi-purpose regional ecosystem geochemical survey in Hebei province, we do the distribution test and correlation analysis on the data we have collected, and then use principal component analysis and regression analysis methods to separation and replacement the anomaly value of Cd, Hg, Pb of the surface and deep soil. According to the above analysis, we got the geochemical background of Cd, Hg, Pb in our study area. Also we contrast our result with the value got by the traditional method and validate our value by the method of enrichment factor. On the other hand, according to the method of the layout of the sample, questionnaires and the data collection, we got data of these three metal elements of irrigation water, atmospheric dust, fertilizer, wheat, corn seeds. On this basis, we got the input flux of the irrigation water, atmospheric dust and fertilizer and the output flux of the wheat and corn. From all data we have got above, we can get the annual net increase of these three metal elements, and estimate the content of soil metal elements in our area for the next 10 years,50 years and so on.Conclusions we have got in this study are:1. The basic information on the geochemical background map obtained by multiple linear regression analysis is roughly the same with the information reflected by the map which obtained by the traditional method. And the higher and lower background area of Cd, Hg, Pb is basically coincide, though there may exists some differences, such as the originally high background area may be removed as the unusual so as can not be displayed on the background map. This may shows the method of multiple linear regression is superior to the traditional method in anomalies separation and background extraction.2. The study of input and output flux of the Cd, Hg, Pb in the surface soil indicates that the atmosphere dry and wet deposition is the main exogenous input channels for most of the area, which has significant impact on the increase of Cd, Hg,...