Spatial Distribution Characteristics And Pollution Assessment Of Heavy Metals In Soils Of Huainan Coal Reclamation Area

Mining soil pollution repair problem by people from all walks of life attention for a long time,especially in huainan this "coal-mining city," said the city,the mining area of the problem of heavy metal pollution has been highly attention,this paper studies a set mine FuKen District with the method of coal gangue filling reclamation,land reclamation after the nature of the soil structure and physical and chemical environment changed,Moreover,the pollutants in coal gangue may migrate through a series of reactions,causing pollution to soil,affecting land recovery and utilization or extending the reclamation life of the reclamation area.The content levels of organic matter,available potassium,Cd,Cr,Pb,Zn,Ni and Cu in the no.1 huainan Pan mine studied in this paper were analyzed by spot distribution,sampling,and single factor pollution index,Nemero pollution index and ground accumulation index.The potential ecological risk index and other conventional comprehensive evaluation methods were combined with grey correlation degree and AHP-fuzzy comprehensive evaluation model to evaluate soil heavy metals in reclaimed areas.Surfer11.0 and SPSS26.0 were used to analyze the spatial distribution characteristics and correlation between physical and chemical indexes and heavy metals.(1)Through data analysis,the order of main pollutants is cadmium>Chromium>Copper>Nickel>Zinc>lead.It can be concluded that cadmium share rate is the highest in the reclamation area of Pan I Mine,followed by chromium,so the main heavy metal pollutants in the soil of the reclamation area of Pan I mine are cadmium and chromium.(2)According to correlation and principal component analysis,it can be seen that there is a significant positive correlation between CD-organic matter,and a positive correlation between CD-Zn and Zn-Cu,but the significance is not high.Pb-cu,Zn-Ni showed significant negative correlation,and Ni-Cu showed negative correlation,but the significance was not strong.Therefore,organic matter,Cd,Zn and Cu can be obtained,indicating that their contents are closely related to each other(3)Through the evaluation of heavy metals,it is concluded that the soil contaminated by heavy metals in the reclamation area of Pan I Mine is at a low level.According to the soil related standards and background values,the evaluation result is that the soil is almost at the level of class i clean,indicating that the soil environmental quality of Pan I mine has been greatly improved after nearly 11 years of reclamation..(4)The results of the potential ecological risk assessment of heavy metals showed that the RI of 12 of the 15 sampling points were all over 150,indicating that the potential ecological risk of the mining area was at the moderate ecological risk level.