Determination of metallic element contents in PM2.5 and health risk assessment in a district of Taizhou City,2022
Objective To investigate the changes in metallic element contents in atmospheric PM2 5 and to assess the human health risk in a district of Taizhou City in 2022.Methods PM2.5 samples were collected in surveillance sites on days 10 to 16 each month in 2022,and the contents of 12 metallic elements were determined in PM2.5 samples using inductively coupled plasma mass spec-trometry(ICP-MS).The source of metallic elements was identified with enrichment factor,and the human health risk was evaluated.Results The highest mean concentration of metallic elements in atmospheric PM2.5 samples was Mn,followed by Pb,As,Se,Cr,Ni,Sb,Cd,Hg,Be and Tl,and there were season-specific concentrations of Al(H=13.932,P＜0.05),Cd(H=11.817,P＜0.05),Hg(H=15.836,P＜0.05),Ni(H=8.423,P＜0.05),Se(H=7.876,P＜0.05)and T1(H=14.316,P＜0.05).The enrichment factors of Cr,As,Sb and Cd were all＞10.If human exposure to external environments reached 3 h/d,Cr may cause a carcinogenic risk to adult men and women and children,and human exposure to external environments reached 5 h/d,As may cause a carcinogenic risk to adult men and women.Conclusions Man-made pollution was the predominant source of metallic elements in PM2.5 in the study district of Taizhou City in 2022,and the concentrations of metallic elements varied in seasons.Cr and As have a high potential human health risk,which should be paid much attention to.
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