<原著論文>群馬県における二酸化窒素濃度の地域分布状況と経年変化の傾向

概要

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The N0_2 concentration was measured in atmosphere of many cities, towns and villages in Gunma prefecture from 1988 to 1996. In order to measure N0_2,filtration paper in a small plastic tube (I.e. capsule), moistened with 20% triethanolamine solution, was used. The N0_2 concentration was measured for degree of purple using Saltzman Reagent. Investigations for seasonal changes of N02 concentration in Gunma prefecture were carried out 2 times per year, I.e. at spring (June) and winter season (December), and demonstrated an upward tendency of almost winter season. When 70 cities, towns and villages in Gunma prefecture were administratively divided into four area, such Tomo area (East area), Tyumo area (Central area), Seimo area (West area) and Hokumo area (North area), the Tomo area usually showed an upward tendency of NO_2 concentration. The order of the upward tendency in these four area were Tomo>Tyumo>Seimo>Hokumo. The prefectural distribution of N0_2 concentration in the Kanto district showed an upward tendency in Tokyo and its surrounding area which was higher than Gunma prefecture. These investigations suggested that the source of the N0_2 is located in the directions of the Eastern area in Gunma prefecture or in Tokyo and its surrounding area.
群馬大学の論文
2000-03-31