ABSTRACT
The significance of the study on the human healht effects of inhalable particulates(PM10) was pointed out,specific properties of inhalable particulates,such as chemical components,aerodynamic behavior and transference in respiratory tract,were then presented.The serious harm of inhalable particulates on human health were summarized based on research results of epidemiological study,animal toxicological study and clinical study,and research emphasis to which should pay more attention in the future study of this aspects was also suggested.
ABSTRACT
Objective To study the chemical composition and the sources of indoor PM10 in some residential houses in Beijing. Methods PM10 samples were collected using cascade impactors in smoker's and non-smoker's homes in winter. The mass concentrations and enrichment characteristics of nineteen elements, such as Al, Si, and S in airborne particles were analyzed by proton induced X-ray emission (PIXE) and enrichment factor. Results The concentrations of 19 elements were higher in smoker's homes than those in non-smoker's homes in winter, especially K and S concentrations were 2-4 times of those in non-smoker's homes. Al, Si, S, K, Ca and Fe made greater contribution to concentrations of elements in PM10, of which K and S accounted for 72% of total elements in smoker's homes while Al, Si and Ca amounted to 57% of total elements in non-smoker's homes. Conclusion Al, Si, Ca, Ti and Fe come from natural sources while S, Zn, Pb, Cr, Cu, As, Cl and P originated from anthropogenic sources such as smoking, coal combustion and oil combustion.