大阪地方の大気浮遊塵に含まれる種々の微量元素

抄録

In order to study in detail the area dependency of the concentrations of various trace elements in the atmosphere over Osaka district, simultaneous measurements of them were made at thirty stations by the use of instrumental neutron activation analysis and energy dispersive X-ray fluorescence analysis. From the measured average concentrations in four weeks, the concentration variation over the area was studied by calculating the coefficients of variation for 31 elements. Variation coefficients for the elements, Ba, Hf, Ta, Ag, Cd, Zn, Se, Sb, W and Cr, were relatively large. Against this, those for the elements, Na, K, Rb, Cs, Sc, V, Br, Th, Pb, Al, Lu, Ti and As, were relatively small. In order to study the relationships among concentrations of various elements, linear correlation coefficients were computed between all possible pairs of elements including dust concentration. The values of the obtained coefficients ranged from nearly zero to 0.97. Correlation coefficients for La-Ce, Ce-Sm, Fe-Co, Zn-Pb, Fe-Zn, Rb-Cs and so on were very large, while those for Al-Ag, Al-Cd, Ba-Ta, V-Ag, Al-Ta, Ba-Ta and so on were very small. It appears that a study of the distributions of various elements over an industrial area and the correlations among them may give information about the major sources and the atmospheric behaviors of the elements in question.