Study On Environmental Hydrogeochemical Characteristics Of Shallow Groundwater In Sunan Ore Area Of Huaibei Coalfield

With the continuous deepening of industrialization and urbanization,the quality of groundwater environment has attracted widespread attention from all walks of life.With limited surface water resources,shallow groundwater is an indispensable natural resource for human life and agricultural irrigation.Because shallow groundwater is buried shallow,it is closely related to the surface environment of mining area,especially in coal mining area,the discharge of mine wastewater,agricultural non-point source pollution and domestic sewage may cause inorganic or organic pollution to shallow groundwater,and the water environment quality is seriously threatened.Based on this,this paper takes the shallow grounndwater of Sunan mining area in Huaibei Coalfield as the research object.Through field investigation,spot sampling,analysis and test,the characteristics of conventional ion components,trace elements,?18O/?2H isotopes,DOC and DOM in the shallow groundwater in the dry and plentiful period are discussed,and the environmental quality assessment of the shallow groundwater in the study area is carried out.The main results achieved are as follows:(1)Through single-factor analysis of variance,the content characteristics of conventional components in shallow groundwater during dry and wet periods in the study area,it is found that pH,TDS,Ca2+ and Mg2+ have obvious seasonal changes,It indicates that the contents of pH,TDS,Ca2+ and Mg2+ in shallow groundwater in the study area may be related to the superficial environment of the mining area and the replenishment of rainwater.(2)By analyzing the content of 18O and 2H in the shallow groundwater and surface water in the study area,the results show that both the shallow groundwater and surface water in the study area are from atmospheric rainfall.The spatial distribution of 18O and 2H in shallow groundwater may be related to the influence of coal mining,human activities and recharge of surface water.(3)Parallel factor analysis is used to analyze the dissolved organic matter(DOM)in shallow groundwater and surface water during wet and dry periods,and it shows that the content of humus-like substances in shallow groundwater and surface water in wet periods is relatively high;the results of fluorescence index analysis show that the water Shallow groundwater and surface water are affected by human activities more intensely than in dry seasons.(4)The improved Nemero index method was used to evaluate the shallow groundwater in the dry and wet periods in the Sunan mining area.The results show that the quality of shallow groundwater in the wet period is significantly worse than that in the dry period,which may be the same as the rain erosion in the wet period.Contaminants are brought into the groundwater;it also further shows that shallow groundwater is easily affected by the superficial environment.Figure 20 table 16 reference 95...