Abstract
Objectives: The purpose of this study is to investigate the mass concentration of nanoparticles and understand the characteristics of elements of heavy metal concentrations within nanoparticles in the air using Micro-Orifice Uniform Deposit Impactor Model-110 (MOUDI-110), based on indoor and outdoor air. Methods: This Study sampled nanoparticles using MOUDI-110 indoors (office) and outdoors at S University in Asan, Korea in order to reveal the concentration of nanoparticles in the air. Sampling continued for nine months (10 times indoors and 14 times outdoors) from March to November 2010. Mass concentrations of nanoparticle and concentrations of heavy metals (Al, Mn, Zn, Ni, Cu, Cr, Pb) were analyzed. Results: Indoors, geometric mean concentration of nanoparticles ranged in size from 0.056 to 0.10 and those of 0.056 or less recorded 0.929 and 1.002 , respectively. On the other hand, the levels were lower outdoors with 0.819 and 0.597 . Mann-Whitney U tests showed that the difference between the indoors and the outdoors was statistically meaningful in terms of particles of 0.056 or less (p or less in size presented a statistically meaningful difference during the summer (p to 0.10 and those of 0.056 or less recorded 1.699 and 1.189 in the outdoors. In the indoors, the levels were lower, with 0.745 and 0.617 . Cr and Ni at the size of 0.056 or less, both of which have been known to pose severe health effects, recorded higher concentrations indoors with 0.736 and 0.177 , compared to 0.444 and 0.091 outdoors. By season, Zn, Ni, Cu and Pb posted a high level of indoor concentration during the fall. As for Cr, the level of concentration indoors was higher than outdoors both during the summer and the autumn. Conclusion: This study indicates the result of an examination of nano-sized particles and heavy metal concentrations. It will provide useful data for the determination of basic nanoparticle standards in the future.
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