Reliability Analysis of CMB Method on Evaluation of Source Apportionment to Particulate Air Pollutants
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概要
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Chemical Mass Balance (CMB) method is one of the most popular techniques to evaluate quantitatively the apportionment of release sources using the chemical data of particulates measured at the source and environment.<BR>In this study, the reliability of CMB method was investigated according to data either inhereing errors in source and environmental profiles or involving fluctuation in source profile data. Monthly concentrations of chemical elements at 4 receptor sites were calculated using an atmospheric diffusion model for artificial source profile data, and the "real apportionments F*" of each source type were determined for all of 48 samples. The source apportionments F were determined using the data involving errors or fluctuations. The reliability of CMB method was evaluated by comparing F* with F. Measurement error was assumed to be random in the range of 0-30%, and fluctuation in source profile data was assumed to obey the lognormal distribution in the range of 1-3 of fluctuation factor.<BR>Source type having poorly characteristic indicator element does not have obvious quantitative relation between concentration of indicator element and the source apportionment, and then reliability of apportionment of such a source is low. On the other hand, in the case of source having highly characteristic indicator element, the apportionment is inversely proportional to the concentration of indicator element.<BR>Assuming the allowable limit of error in the estimation of each source apportionment to be 25% of the "real" value, the maximum error permitted is 15% in the measurement of source and environmental profile data, and the maximum permissible fluctuation factor is 1. 3 for the source profile.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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