Research Of Groundwater Chemical Characteristics And Pollution In The Da Bao Dang Of Shenmu

In northern Shaanxi area, the precipitation is very little and the evaporation isintense.As the center of the energy base in yulin,its surroundings areas are the concentrationof the energy companies and residents living,at the same time agricultural and livestockproduction are more in this regions.da bao dang town of shen mu and the surrounding area asthe research object,make full use of survey data obtained and water chemistry and waterquality analysis of test data,the study area groundwater water chemical characteristics andlaws,on groundwater quality and pollution assement and analysis of groundwater,waterchemistry and cause of pollution,to area residents looking for high quality drinking watersource,and the rational exploitationand utilization and protection of groundwater resourcesand provide a scientific basis.Through the study of groundwater chemical composition characteristics,draw aconciusion that:Generally speaking,river valley area are main type of HCO3.SO4andHCO3.CL,hilly area of groundwater chemical types are HCO3. Ca, in the groundwater flowdirection the thickness of TDS is inversely proportional to the driver,s elevation sea level,TDSand main ion appears by valley area to upland along the groundwater flow direction graduallydecreased.Using a series method,the study area groundwater chemical test data were analyzed,thethree nitrogen in groundwater area to the main pollution composition.using the fuzzycomprehensive evaluation method of groundwater quality evalution,and use of the Grubbstesting method and the mathematical statistic method to study the components of thegroundwater chemical background value,based on the single factor pollution in-dex method togroundwater pollution was evaluated, the result show that：the quality of the hily area is betterthan valley area.local residents are looking for good drinking water source to the object of thestudy area;groundwater pollution are mainly NO3-N pollution,and pollution areas mainlyconcentrated in the Tuwei River Valley area and major branch gully ravine area. Based on the groundwater chemistry and pollution causes analysis shows:the chemicalcomposition of water of the study area are mainly formed into dissolve and sedimentinteraction,the runoff of groundwater,vaporation and concentration effect and the joint effectof human activity. The potential sources of contamination and groundwater vulnerabilityanalysis,the study area source of pollution in the main distribution area,lots of seriouspollution for Tuwei river valley area and major branch gully rvine area.Study on thepollutionof NO3-N main influence factors: source of pollution,groundwater evaporation andgroundwater redox environment,in which the longitudinal NO3-N pollution mainlyconcentrated in the water depth is less than10.0m horizon,showthat it is not easy pollutedwhen the thickness of aeration zone more than10.0m.Spread out underground water chemistry and water pollution in the area.the results ofthis study can be for rational development and utilization of groundwater and looking forsource of high quality drinking water,at the same time provide scientific basis for.