Pollution characteristics and chronic health risk of heavy metals in atmospheric environment PM2.5 in Nanjing city
Objective To understand the pollution characteristic of PM2.5 and the heavy metals in PM2.5 in Nanjing,and analyzes the source and assesses the health risk of heavy metals.Methods The PM2.5 samples collected from 10th to 16th of each month in 2021.The contents of PM2.5 and heavy metals were determined by weighing method and inductively coupled plasma mass spectrometry,and source apportionment was determined by using enrichment factor and chronic health risks of heavy metals were assessed.Results The median of the average annual PM2.5 concentrations of the Jiangbei new district and Jiangning district were 39 and 36 µg/m3 respectively,with significant difference(P＜0.047).The PM2.5 concentrations of the Jiangbei new district were higher than those in Jiangning district.The seasonal differences of PM2.5 were statistically significant(P＜0.01),and the concentrations of PM2.5 was highest in the first quarter and was lowest in the third quarter.The difference of the concentration of Cd,Se,Tl was statistically significant in the different seasons(P＜0.05).The EF of the heavy metals in two monitor sites were greater than 10,and that the element was mainly affected by human activities.The non-carcinogenic risks of the heavy metals in two monitor sites were less than 1,and they were lower than the safe level for children and adults.The carcinogenic risks from As,Cd,Cr in Jiangbei new district and As,Cr in Jiangning district were in the acceptable level(10-6-10-4)for children and adults,and they posed a carcinogenic risk to all people.Cr had a highest carcinogenic risk and followed as As.Conclusion The heavy metals in PM2.5 mainly come from anthropogenic pollution.The non-carcinogenic risk of inhalation of heavy metals is low,and the potential carcinogenic risk of some heavy metals is under average acceptable level in Nanjing.
Fine particulate matterHeavy metalsEnrichment factorHealth risk assessment
NETL
NSTL
万方数据
