Assessment Of Heavy Metal Pollution In Soil,Water And Crops Of A Town In Pingyao County And Its Control Measures

In the process of human existence and development,soil,water body and crops are the important material base,but also the essential material for people's survival.The quality of soil,water and crops will not only affect people's normal life.Therefore,real-time monitoring of heavy metal elements in the environment is of great significance to environmental protection and human health.Through field investigation,17 soil samples,5 crop samples(pepper,millet,corn,peanut,sorghum)and 7 irrigated water samples were collected in this paper.By the determination of heavy metal elements in various samples The content was evaluated by single factor index and Nemero comprehensive index.The results showed that the single factor indices of soil samples in a town of Pingyao County were all less than 1,indicating that heavy metals did not cause soil pollution in these areas.Not contaminated by heavy metals.But near the factory site and near the main road,the soil index is relatively high.According to the potential ecological hazard index method,the ecological risk index is RI<150.The degree of soil heavy metals in this area is minor pollution.Combined with the single factor index method,the Nemero index evaluation method is used to analyze the current situation of irrigation water pollution,and the As single factor index of the heavy gold element of the sample point 2 in the water body is higher than 1,and the heavy gold of the sampling point is 3.The single factor index is higher than 1,and the single factor index of other heavy metals is lower than 1.It shows that the pollution of heavy metal elements in the water body of a town in Pingyao county is smaller,and the single factor index of two metals,As,Hg,is more than 1,but in 1-2,it is relatively light Micro pollution.It can be seen from the water weight metal element index that the composite index of the second sampling point is less than 1<2,which belongs to light pollution.The NMER of 3 sampling points is less than 1,but above 0.7,it is a warning limit.The composite index of 3 sampling points is less than 0.7,which belongs to clean range.From the situation of heavy metal pollution in crops,Pb elements in corn,sorghum and millet crops exceed the standard value in each crop,which should be paid more attention to,find the source of pollution and strengthen the source control.And put forward effective prevention and control measures.