Soil Heavy Metal Pollution and Environmental Quality Risk Assessment Around Typical Plots in Yancheng City

LIU Xinghua; YANG Li; QIN Chun; DING Ying; LIU Yanyan; PAN Zongjin

doi:10.14069/j.cnki.32-1769/s.2023.06.003

Abstract：By evaluating the risk of heavy metal pollution in industrial parks,transportation arteries,urban suburbs and port areas,a basis was provided for the agricultural utilization in their suburbs.The detection and environmental quality risk assessment of zinc(Zn),copper(Cu),cadmium(Cd),chromium(Cr),nickel(Ni),lead(Pb),mercury(Hg)and arsenic(As)were conducted in the 74 points of surrounding agricultural land and plants(wheat,barley and reeds)in the west traditional agricultural area,the industrial belt of the old National Highway 204-urban industrial park,and the coastal port area.The results showed that the 8 elements content in the soil at the measured site all exceeded the geochemical benchmark values of soil elements in Jiangsu Province.The elements content in all spot samples exceeded by more than 30％were Cd(100.00％),Cu(75.68％),Zn(60.81％),As(51.39％)and Hg(36.00％),respectively,in which Cd(66.67％)and As(4.00％)content exceeded the standard according to the screening values in GB 15618-2018"Soil Environmental Quality-Risk Control Standard for Soil Contamination of Agricultural Land",while taking the control value as a reference,only Cd content exceeded the standard,with an exceeding proportion of 20.27％.The results of single factor pollution index and comprehensive pollution index indicated that the typical plots of old National Highway204-urban industrial park and the areas west of it were prone to moderate to severe Cd pollution,resulting in high environmental quality risks,while the plots to the east was slightly polluted with Cd,and the risk was relatively low.The detection results of the effective content of 8 heavy metals and the corresponding element content in plants showed that the content of these 8 elements were all below the standard value of plant element limits,and had no significant impact on the growth and development of the tested plants,reflecting the complex migration and transformation characteristics of heavy metals in the soil-plant system.