Abstract
In order to further research on the polluting condition and spreading features of heavy metals in urban surface soil, this study makes statistical analysis on indexes of 8 heavy metal concentrations. Then Are GIS geo-statistical analyst was used for Kriging interpolation of each kind of heavy metal concentration before figuring out the spatial distribution. Firstly, heavy metal contamination was analyzed by single-element pollution evaluation and multi-element pollution evaluation, before rationality analysis. Then, correlation extents between heavy polluting metals were calculated in each region by rationality analysis, leading to the correlations between the heavy metals. Finally, based on propagating features of different heavy metals, propagation models in water and atmosphere were established. Additionally, according to heavy metal distribution map, distribution point of high concentration was searched. With the assumption of the number of pollution source, theoretical concentration of sample point could be figured out, after the superposition of pollution intensity using propagation model based on data of the distribution points. Thus, the optimization model was established for locating the pollution source by minimizing the difference between theoretical value and actual value.
Highlights
Heavy metal pollution means an environment pollution caused by heavy metals and its compound, which is one of the pollution doing great harm to human life (Liao et al, 2004)
Research of Bilos et al (2001) shows that many heavy metal elements would be released to atmosphere if too many pollution sources gathering in a city
Similar research was done by Kang Lingfen, who found that the heavy metal contamination in soil near main streets is higher than that in parks
Summary
Heavy metal pollution means an environment pollution caused by heavy metals and its compound, which is one of the pollution doing great harm to human life (Liao et al, 2004). A city with high influence intensity, long history and high industrialization and urbanization level suffers more heavy metal pollution (Chu and Zhu, 1994). Research of Bilos et al (2001) shows that many heavy metal elements would be released to atmosphere if too many pollution sources gathering in a city. Blake’s research shows that atmospheric deposition, including the absorption of gas-liquid suspension and precipitation, would lead to more heavy metal element in soil and crops (Blake and Goulding, 2002). According to research of Bandhu et al (2000), close relationship was found between heavy metal contamination in atmosphere and that in soil. Optimization model for locating the pollution source are established after building the propagation model under the condition of both atmosphere and water based on propagating features of heavy metal.
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