Study On Pollution Status And Risk Of Heavy Metals And PAHs In Soil Of Northern Shaanxi Energy Chemical Industry Base

In order to understand northern shaanxi energy chemical industry base in the soil pollution status of heavy metals and polycyclic aromatic hydrocarbons, in yulin mining area within the scope of this study selected the 38 soil sampling points, which were examined respectively analyzed eight kinds of heavy metals(As, Cr, Cd, Cu, Hg, Pb, Mn, Zn) and 16 kinds of polycyclic aromatic hydrocarbons(Nap, Acpy, Acp, Flu, Phe, Ant, PLT, Pyr, Ba A, CRH, Bbf, Bkf, Bap, Ind, Dba, Bghip) pollution situation, and the relevant pollution risk analysis. For the urban soil pollution management and provide a basis for the environmental protection and restoration, main conclusions are as follows:(1)Yulin mining area within the scope of the eight kinds of heavy metal contaminated soil were different degree and the content of heavy metals in the range of 0.11-4850μg/g,compared with the soil background values in Shanxi Province, As、 Cr、Cu、Zn、 Cd、 Pb、 Hg and Mn are respectively 5.6、4.4、 15.1、 8.5、 149、 9.3、 88、 4.3 times.The results show that the yulin soil Cd, Hg, Cu pollution is given priority to, from a certain extent, can explain, soil heavy metal pollution is more serious in yulin area. The main reason for the heavy metal pollution is due to the excessive exploitation of mines, random accumulation of solid waste and atmospheric sedimentation, wastewater irrigation, etc.(2)Analyses the correlation between the heavy metal elements, the results showed that: Cr-Cu, Cu-Cd, Cd-Pb, Cd-Hg, Pb-Hg, Cr- Mn has good correlation, the correlation coefficient respectively is 0.545, 0.522, 0.883, 0.565, 0.628, 0.619. As you can see, Cd, Pb highest correlation, Cd and Pb in the soil element may have the same source, after precipitation and adsorption accumulated in the soil, other relevant relationship between heavy metal element is not high, belongs to the mixed soil heavy metal pollution sources.(3)Respectively using mei pollution index method and to accumulate within the index method of 8 kinds of heavy metal pollution risks are analyzed, and the results show that the obtained by mei luo pollution index method in sampling point S22 pollution index, the highest average of 173.55, beyond the lowest severe pollution more than 50 times; Accumulation exponential method is used to reach 38 sampling points have 25 points were moderately polluted, there are four points of pollution index belong to the strong level of pollution, should cause enough attention.(4).For energy chemical industry base in soil samples PAHs pollution were analyzed, and the results showed that: 16 kinds of PAHs in soil total concentration between 2.6 to 864.2 mu g/kg, with a mean of 94.5 mu g/kg, the highest PAHs content two points are respectively S22 and S18, the content in the samples were 190.8 mu mu g/kg and 188.2 g/kg.(5)To calculate the mining area of yulin city PAHs in soil under different exposure pathway for children and adult lifetime cancer ris.Including ILCRs due to respiration than other two exposed way ILCRs is small, from the point of total ILCRs, mining PAHs in soil on human health impact the size of the order from high to low is: adult female> adult male >girl > boy..