JDR Vol.3 No.4 pp. 261-269
doi: 10.20965/jdr.2008.p0261


Arsenic Originating in Kusatsu Hot Springs, Gunma, Japan, and Arsenic Pollution Status of Kusatsu Rivers

Yoshikazu Kikawada*, Satoshi Kawai**, Kazuhiko Shimada***, and Takao Oi*

*Faculty of Science and Technology, Sophia University, 7-1 Kioicho, Chiyoda-ku, Tokyo 102-8554, Japan

**Kansai SE Center, Nihon Parkerizing Co., Ltd., 2145-1 Komizo, Nakashima, Kurashiki-shi, Okayama 710-0803, Japan

***Faculty of Science, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan

March 25, 2008
June 2, 2008
August 1, 2008
arsenic, hot spring, neutralization system, water mediation, dam reservoir
Kusatsu hot springs at the eastern foot of the Kusatsu-Shirane volcano is a famous spa area in Japan. Its hot springs are strongly acidic making local rivers acidic, requiring lime water neutralization. We determined the arsenic concentration in hot springs, rivers, and neutralization products, to calculate the mass balance of arsenic in river systems. Hot springs supply a total of 45 tons a year in arsenic to local rivers, which transport some 28 tons a year — most of which is accounted for by Bandaiko hot spring and the Yu River. After neutralization, these flow into the Shinaki Dam reservoir, which accumulates large amounts of suspended neutralization products. Mass balance calculation suggests that arsenic dissolved in river water is nearly completely coprecipitated with or adsorbed by neutralization products, so that Shinaki Dam reservoir accumulates some 25 tons of arsenic yearly.
Cite this article as:
Y. Kikawada, S. Kawai, K. Shimada, and T. Oi, “Arsenic Originating in Kusatsu Hot Springs, Gunma, Japan, and Arsenic Pollution Status of Kusatsu Rivers,” J. Disaster Res., Vol.3 No.4, pp. 261-269, 2008.
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