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Onuki, Toshihiko
Hoshasen To Sangyo, (106), p.16 - 22, 2005/06
no abstracts in English
Fukushi, Keisuke*; Sasaki, Miwa*; Sato, Tsutomu*; Yanase, Nobuyuki; Amano, Hikaru; Ikeda, Hodaka*
Applied Geochemistry, 18(8), p.1267 - 1278, 2003/08
Times Cited Count:220 Percentile:95.91(Geochemistry & Geophysics)At Nishinomaki abandoned mine district, the water is acidic and contains much amounts of arsenic. However, arsenic concentration decreases downward without any artificial treatment. To understand the mechanism of the natural attenuation, the acid mine drainage and the ochreous precipitates were collected. The samples were analyzed by XRD, IR, ICP-MS and ion-chromatograph. The precipitates were investigated by selective extraction procedure. These results were interpreted with those calculated by the geochemical code. The contamination of water has been result from oxidation of pyrite and realgar and subsequent release of iron. The released ferrous iron transforms to ferric form by bacterial oxidation and then schwertmannite forms immediately. While the arsenic concentrations in the stream are lowered to background level at downstream, these in the ochreous precipitates are up to 60 mg/g. The iron hydroxide has been known to exhibit the high sorption affinity to arsenate. Hence, arsenic is effectively removed by the schwertmannite from the contaminated water and attenuated naturally.
Onuki, Toshihiko; Sakamoto, Fuminori; Kozai, Naofumi; Samadfam, M.; Sakai, Takuro; Kamiya, Tomihiro; Sato, Takahiro*; Oikawa, Masakazu*
Nuclear Instruments and Methods in Physics Research B, 190(1-4), p.477 - 481, 2002/09
Times Cited Count:7 Percentile:44.29(Instruments & Instrumentation)Concentrations of As, Fe, Si and S contained in the biomat formed in surface-water at arsenic mine have been measured at TIARA facility of JAERI. It is obtained that As and Fe are accumulated in the biomat.
JAERI-M 6669, 19 Pages, 1976/08
no abstracts in English
;
Bunseki Kagaku Benran, p.209 - 217, 1971/00
no abstracts in English
; *
Bunseki Kagaku, 19(1), p.17 - 22, 1970/00
no abstracts in English
*;
Nihon Kagaku Zasshi, 84(10), p.823 - 826, 1963/00
no abstracts in English
; ; Shiba, Koreyuki; *
Nihon Kagaku Zasshi, 82(3), p.343 - 347, 1961/00
Times Cited Count:4no abstracts in English