@article{oai:ir.kagoshima-u.ac.jp:00000685,
 author = {竹下, 寿雄 and TAKESHITA, Toshio and 前田, 滋 and MAEDA, Shigeru and 大木, 章 and OKI, Akira},
 journal = {鹿児島大学工学部研究報告, The research reports of the Faculty of Engineering, Kagoshima University},
 month = {Nov},
 note = {The volcanic ash from Mt. Sakurajima was collected together with rain water monthly from April 1986 to March 1987 at 14 locations in Kagoshima city and 7 locations in Sakurajima. After the samples had been filtered, the residue was dried and weighed, and the filtrate was analyzed for SO_4^{2-}, Cl-and water-soluble matter as well as for pH. The amount of sulfur oxides absorbed on a PbO_2-candle were measured at the same locations (except for 2 locations of Sakurajima) as with ashfall measurement. The average monthly ashfall at the 14 locations in Kagoshima city was 211 ton/km^2 and that at 7 locations in Sakurajima was 2,056 ton/km^2. Both values were half, or less than half of those values observed in the last fiscal year. The falling weights of SO_4^{2-}, Cl^- and water-soluble matter for this fiscal year were generally lower than those for the last year. However, the frequency of acidic rain was considerably higher than that for the last year. 
The average amount of sulfur oxides absorded on the PbO_2-candle in Sakurajima for this fiscal year was much less than the corresponding average for the last year.},
 pages = {95--112},
 title = {鹿児島市内及び桜島の大気汚染(降灰)調査(第9報) : 昭和61年度調査報告},
 volume = {29},
 year = {1987}
}