Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Original Papers
Evaluation of Ionic Pollutants of Acid Fog and Rain Using a Factor Analysis and Back Trajectories
Tetsuya ADZUHATAJunko INOTSUMETomoko OKAMURARyoei KIKUCHIToru OZEKIMasahiro KAJIKAWANobuaki OGAWA
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2001 Volume 17 Issue 1 Pages 71-76

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Abstract

Fog and rain water samples were collected at the same time in the Akita Hachimantai mountain range in northern Japan from June to September in 1998 and 1999. The various ion concentrations in these samples were analyzed, and the fog droplet sizes were measured for each fog event. As the fog droplet size increased, the ion concentration decreased. The slope of log-log plots of the concentration versus the droplet size differed with the kind of ion. In order to characterize the air pollutant, moreover, these data were quantitatively analyzed by an oblique rotational factor analysis. We found that three factors were extracted as the air pollutant source: (NH4)2SO4, acids (HNO3 + H2SO4) and sea-salt. Combining the factor analysis with the 72 h back-trajectory at 850 hPa level, we found that the contribution of each factor varied with the transport pattern of air masses.

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© 2001 by The Japan Society for Analytical Chemistry
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