Objective To analyze the pollution levels of metal and metalloids in fine particulate matter of cooking oil fume(COFs-PM2.5)and assess their health risks to human health.Methods Cooking oil fumes were generated by heating rapeseed oil in an iron pan using an electric stove in a closed laboratory,and COFs-PM2.5(oil fumes group)was collected using a high-load particulate sampler.Meanwhile,indoor air was also collected in another laboratory as a control group.The collected COFs-PM2.5 filter membranes were ultrasonically extracted with nitric acid,and the contents of 12 metals/metalloids in the COFs-PM2.5,including beryllium(Be),aluminum(Al),chromium(Cr),manganese(Mn),nickel(Ni),arsenic(As),selenium(Se),cadmium(Cd),antimony(Sb),mercury(Hg),thallium(Tl),and lead(Pb),were detected using inductively coupled plasma mass spectrometry(ICP-MS).The health risk assessment was conducted in accordance with the Technical Guidelines for Environmental Health Risk Assessment of Chemical Substances(WS/T 777-2021).Results The main elements in COFs-PM2.5 were Al,Cr,and Ni,with concentrations of 215.74±28.27,37.54±9.05,and 20.87±3.54 ng/m3,accounting for 91.2％of the metal components.Among them,the Cr and Ni contents in the oil fumes group were higher than those in the control group(t=4.00,10.71,both P＜0.01).The health risk assessment showed that the chronic non-carcinogenic and carcinogenic risks of metals/metalloids in COFs-PM2.5 to adult women and men were at a low level.The non-carcinogenic risk was in the order of Ni＞Mn＞As＞Al＞Sb＞Cd＞Be＞Se(with hazard quotient(HQ)values all＜1).The carcinogenic risk was in the order of As＞Ni＞Cd＞Be＞P(with carcinogenic risk(CR)values all＜1.0X10-6).Conclusion There is a certain level of pollution of metals/metalloids in COFs-PM2.5,but the health risks to adult women and men are at a low level.
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