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Seasonal characteristics of chemical compositions of the atmospheric aerosols collected in urban seaside area at Tokaimura, eastern central Japan

東海村海岸地区で採取したエアロゾルの化学組成の季節変動特性

Fu, F.; 渡部 和男; 矢吹 貞代*; 赤木 右*

Fu, F.; Watanabe, Kazuo; Yabuki, Sadayo*; Akagi, Tasuku*

東海村海岸地区で2002年7月$$sim$$2003年7月にかけてアンダーセン型エアサンプラーを用いてエアロゾル試料を粒径別に採取した。エアロゾルを水溶性及び水不溶性成分に分け、それぞれの化学成分を分析し、エアロゾル粒径別の質量,元素組成等の諸データを取得した。その結果、東海村のエアロゾルは、中国の砂嵐の影響を受けていること,海塩粒子が南極のそれより大きく塩素含有率が低いこと等が明らかになった。

Size-separated aerosol samples were collected at Tokaimura urban seaside area of Japan using an Andersen type sampler during July 2002 to July 2003. The size-separated aerosols were divided into water-soluble and insoluble fractions, and chemical compositions (Na$$^{+}$$, Cl$$^{-}$$, NH$$_{3}$$$$^{+}$$, NO$$_{3}$$$$^{-}$$, SO$$_{4}$$$$^{2-}$$, Al, Ca, Mg, Fe, Pb, Th and U) in both water-soluble and insoluble fractions were analyzed. Then, the seasonal variations and the size-distribution in mass concentration and chemical composition have been investigated in detail. Our results showed that the atmospheric aerosol in Tokaimura was obviously affected by dust storm in China, and that sea-salt particles were bigger than those in the Antarctic and were deficient in chlorine.

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