Analysis Of Heavy Metal Pollution Evaluation In Reclaimed Farmland Soil Of Abandoned Construction Land In Pengzhou

Soil is an important part of the ecological environment,the accumulation of heavy metal elements in the soil,and through the atmosphere,water or food chain directly or indirectly threaten human health and even life.Therefore,the investigation and risk assessment of heavy metal pollution in the land used for land reclamation of abandoned land is a very important work.Pengzhou as the study area in this research work,and the research mainly aims at the abandoned construction land reclamation areas of mining land and residential land to plant soil pollution investigation.The investigation,soil sampling,laboratory analysis was used to determine the contents of heavy metals in the soil,and then use the index of geoaccumulation,single factor index method,the potential ecological hazard index method and Nemerow pollution index method to evaluate the model results were analyzed and evaluated on the sample survey on the reclamation of the cultivated land.The main conclusions are as follows:(1)Compared the content of heavy metal of industrial and mining land reclamation with homestead,industrial and mining land content were relatively higher than that of the homestead,but the difference is not great,the main reason is covering layer is transported soil,so the surface crop does not influence.(2)The elements of sampling survey points were lower than the national level two standards but Cd,mainly between the first and two standards,not by Cr,Cu,Zn,Pb,Ag,As,Hg pollution.(3)The results showed that the cumulative index of Cd in the study area was the largest,and the accumulation index of Ag was the lowest in the study area in all the 7 elements of heavy metals,cumulative index and the rate of accumulation of accumulated points from large to small order of Cd > Cu > > Cr > Zn > Hg > Pb > As > Ag >.(4)The soil of single factor evaluation results show that the sampling survey area high Cd polluted area is larger than the 60% of the total number of survey points,by the polluted area for more than half of the total sample survey area,and the other elements were not contaminated.(5)The Nemerow index evaluation results show that the study area is still clean level,but has been in a cordon stage,soil temporarily not subject to significant pollution;comprehensive ecological risk level of the potential risk is the risk of Cd,Hg pollution and its risk rate reached 40%,other heavy metals exist potential risks in probability is very low.It suggestions to establish a set of reasonable and perfect monitoring and evaluation system to utilize and protect the Pengzhou within the scope of all reclamation of arable land,especially basic farmland protection areas,agricultural products production base and vegetable production base;to establish a long-term monitoring mechanism of reclaimed farmland soil pollution,strengthen the abandoned construction land reclamation of arable land management;at the same time pilot plant repair work in the appropriate plots.