| From the second industrial revolution,heavy metal pollution events occur frequently,and caused a great loss.In recent decades the China's heavy metal pollution incident increasing,especially the serious pollution of land,result in that crop yield was reduced,the heavy metal content exceeds bid,the pollution seriously harm people's health.In 2009,an outbreak of the Changqing industrial blood lead paint events,caused extensive attention of the whole society.According to the actual condition of Changqing industrial park,and for the first time in the industrial park on 13.7 km2 range of heavy metal pollution of soil research,and edom ridge smelter by ray and concentric circles for center of the method of combining the soil samples collected 65,as the research object,the analysis of samples of heavy metal lead,zinc,lie between,chromium,arsenic,nickel,the content of the single factor method,nemerow method and potential risk index method of soil pollution degree evaluation,analysis and evaluation wheat seeds the heavy metal pollution.Detailed analysis of distribution of heavy metals,and analyzed the characteristics of the forming reasons.Finally,according to the industrial pollution condition put forward the countermeasures to prevent and control pollultion.Research conclusions are as follows:(1)Refer to GB15618-2008 soil environment quality standard(amendment)level 2 dry land evaluation standard,soil samples each heavy metal pollution index single project average less than 1,I considered that soil level I for analysis,and soil contamination grade for the pollution.(2)Refer to nemerow analysis method,the result of the study shows that the Whole area by the average of calculation,PN = 0.936,it shows that the overall regional,soil level for ?,soil at the level is clean;Dongling metal production plant 1 km within the scope of the soil,the PN = 1.039829,soil level for ?,soil at light pollution levels,crop began to be contaminated.(3)In the whole area,the potential risk index is 26.44,the research area the size of the potential ecological risk index for:Cd>As>Pb>Ni>Cr>Zn;in Dongling metal production plant 1 km within the scope of the soil,the range potential risk index of 18.34,the he potential ecological risk index for:Cd>As>Pb>Ni>Zn>Cr.(4)The content of lead,cadmium,zinc in soil,along with the increase of the distance has a tendency to decrease,arsenic and nickel content is relatively stable,in the dominant wind direction of the southeast and northwest direction it is more obvious.(5)Heavy metal pollution source:no tissue source waste,chimney exhaust dust,chemical fertilizer and pesticide form leads to drug residues,highway vehicle emission.(6)TheChangqing Industrial Park pollution countermeasures are put forward:to strengthen management,the introduction of advanced production technology,the development of cleaner production;increase improver;irrigation altered redox status;organic fertilizer;change the soil heavy metal content;the active use of bioremediation measures,strengthen green.This paper deficiency:Because of the limit of the funds,the sample number is less,it can't complete the whole industrial zone reflect the space distribution features;the selected monitoring project for six kinds of heavy metals,monitoring project is less,it can not reflect the comprehensive soil pollution;and because of the time limit,control plan also imagine the stage. |
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