Estimation of Source Contribution of Atmospheric Aerosols

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In this study, the following four subjects were investigated for the final goal of higher time-resolution analysis of source contribution on particulate air pollution ;1) Establishment of PIXE system for elemental analysis of aerosol particles : Sensitivity and accuracy in PIXE analysis were investigated under the various ion-beam bombardment conditions and measurement conditions using four different types of irradiation chamber. The optimum analytical conditions were determined for the PIXE analysis of atmospheric aerosols. The standard samples prepared in this study were shown to be applied effectively for the calibration of PIXE analysis.2) Characterization of atmospheric aerosols by PIXE analysis : More than 600 atmospheric aerosol samples were collected in the various seasons and sites, including winter heavy pollution episode and Kosa episode. The time changes of elemental concentration had generally peaks in spring and early winter which were caused by Kosa and stable condition … More of atmosphere, respectively.3) Reliability of receptor model evaluating the source contribution to particulate air pollution : the reliability of Chemical Mass Balance (CMB) method and Principal Component Analysis (PCA) was evaluated as a function of error size in the measurement data and/or fluctuation of source profile data. Assuming the allowable limit of error in the estimation of each source contribution, the maximum permitted error size in the measurement data and the maximum permissible fluctuation of source data were suggested.4) Estimation of source contribution of atmospheric aerosols : The seasonal variation and regional fiature of source contribution to atmospheric particulate pollutants were investigated using both CMB and PCA methods. The elemental concentration data obtained in this study as well as it NASN stations were used. Soil source contribution was most significant among the five assumed sources at every site and was elevated in spring every year. On the other hand, the contributions of anthropogenic sources had peaks in early winter. Less