Analysis Of Heavy Metal Pollution In Groundwater On The Lower Reaches Of The Luanhe River

“Green Mountain is the Jinshan Yin Mountain”.Water resources are an important pillar for the sustainable development of the ecological environment and an important strategy to support the steady and healthy development of the national economy.However,the pollution of the groundwater environment has become more serious during the development and expansion of the city.At present,groundwater pollution is a research hotspot of water resources environmental protection,and it is the focus of this research because of the cumulative,long-term and difficult to treat pollution of groundwater by heavy metals.Heavy metal pollution in groundwater not only threatens the safety of ecosystems,but also causes serious harm to the health of residents.Selecting the typical urban-rural integration zone and rural areas,identifying the status of heavy metal pollution in groundwater in the area and analyzing the spatial distribution characteristics of heavy metal ions,qualitative and quantitative research on the source of heavy metal pollution in groundwater has important theoretical and practical value for promoting urban expansion.It also provides a scientific basis for the local government to formulate water conservation policies.This paper takes the North China Plain-Luanhe River as a research area,and deeply analyzes the status of groundwater heavy metal pollution in the study area,and continuously collects 5 stages of shallow groundwater and soil samples in the study area from May to September 2017,through statistical analysis.The spatial distribution and enrichment characteristics of each heavy metal.The principal component analysis was used to qualitatively analyze the sources of heavy metal pollution in groundwater.Finally,using iron ion as the main research object,the multiple regression analysis method was used to quantitatively study the source of Fe³⁺pollution in groundwater.The main conclusions are as follows:1)Through statistical analysis,it is found that Fe³⁺and Pb in groundwater have strong variability,and gradually enriched along the direction of groundwater flow,and the pollution is distributed in a plane.2)Principal component analysis found that the groundwater heavy metal pollution in the study area is mainly derived from the soil parent material,that is,natural sources,human activities,and wastewater discharge from industrial and mining enterprises.Moreover,the sources of Fe and Fe³⁺have strong differentiation,which are affected by the sewage discharge of steel plants,as well as natural factors and human activities.3)Multivariate regression is used to quantitatively describe the contribution rate of three sources of Fe³⁺in groundwater in the region.In the contribution rate of Fe3+ions in groundwater in the fifth phase,the steel plant discharges up to 42.4%,and the maximum contribution rate of natural factors is 43.4%.The contribution rate of human activities is up to 45.4%.