Pollution characteristics,ecological risk and health risk assessment of PM2.5-bound elemental species at mountain site in summer:A case study of Mt.Wudang
To understand the pollution characteristics of PM2.5-bound elemental species at mountain site in summer,PM2.5 samples were collected at the Mt.Wudang National Air Quality Monitoring Station in Shiyan of Hubei Province in June 2018.The concentrations of 18 elements(Na,K,Ca,Mg,Al,Fe,V,Cr,Mo,Cu,Zn,Mn,Ni,As,Se,Cd,Ba and Pb)in PM2.5 were determined by inductively coupled plasma mass spectrometer(ICP-MS),and the sources,ecological and health risks were discussed.The results showed that the concentration of PM2.5 during observation period at Mt.Wudang were ranged from 5.00 μg·m3 to 33.65 μg·m-3,with an average value of(16.84± 7.07)μg·m-3.K,Na,Fe,Ca,Al,Mg and Zn)was the main elements accounting for 97.68％of all detected elements.The enrichment factor(EF)values showed that the EF values of Mo,Zn,Pb,Cd and Se were higher than 100,which may be affected by the regional or long-range transport of pollutants emitted from human activities.The principal component analysis-multiple linear regression(PCA-MLR)showed that the elements species of PM2.5 mainly come from coal burning and motor vehicles(57.57％),industrial production(22.52％)and crustal sources(19.91％).The ecological risk index of heavy metals in PM2.5 at Mt.Wudang is extremely high and Cd,Se and Mo have a very high degree of potential ecological damage.The health risk assessment showed that the comprehensive non-carcinogenic risks(HI)were 2.28x10-2 and 3.04xl0-2 for children and adults,respectively,which are within the acceptable level.The comprehensive carcinogenic risks(CRT)were 4.45×107 and 2.37×10-6 for children and adults,respectively,indicating heavy metal had potential carcinogenic risk for adults.The carcinogenic risk of Cr for adults is 1.88×10-6,indicating that Cr has potential carcinogenic risk in adults.The non-carcinogenic risk and carcinogenic risk to human body followed the order of adults＞children.
PM2.5elementsenrichment factorprincipal component analysis-multiple linear regressionecological riskhealth risk assessment
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NSTL
万方数据
