カゴシマシ オヨビ サクラジマ ノ タイキ オセン (コウバイ) チョウサ (ダイ7ホウ) : ショウワ59ネンド チョウサ ホウコク

The volcanic ash from Mt. Sakurajima was collected together with rain water monthly from April 1984 to March 1985 at 14 locations in Kagoshima city and at 7 locations in Sakurajima. After the samples were filtered, the residue was dried and weighed, and the filtrate was analyzed for SO_4^{2-}, Cl^- and water-soluble matter. The amounts of sulfur oxides absorbed on PbO_2 candle were measured at the same 19 locations as with ashfall measurement. Several heavy metal and phthalic acid ester content in the ashes were also measured for some samples. The average monthly ashfall at the 14 locations in Kagoshima city was 211 ton/km^2 and at the 7 locations in Sakurajima was 2940 ton/km^2. The above averages were larger than the corresponding averages of the last fiscal year. In she samples taken at the Kagoshima city hall (June) contained by weight 1.2 ppm DOP, 11 .3 ppm DBP, 4.9×10^4 ppm manganese. The highest amount of sulfur oxides absorbed on the PbO_2-candle in this fiscal year was 2.39 mg/100cm^2/day, which was observed at Sakurajima Hospital in October. Acid rain was observed at all locations