Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization
Reexamination Certificate
2004-02-03
2008-11-25
Langel, Wayne (Department: 1793)
Hydraulic and earth engineering
Soil remediation
In situ contaminant removal or stabilization
C210S683000, C423S306000
Reexamination Certificate
active
07455477
ABSTRACT:
A new compound represented by a composition formula Fe8O8(OH)8-2x((SO4)a, (HPO4)b)x(a+b=x, 1≦x≦1.75, 0<a≦1.658, 0.092≦b≦x) formed by adding a shwertmannite of a composition formula Fe8O8(OH)8-2x(SO4)x(1≦x≦1.75) to a phosphoric acid solution of a pH value of 2-9 thereby achieving a stabilization by an adsorption of phosphoric acid, shows a very firm stabilization under conditions of 0<a≦1.253 and 0.497≦b≦x. The new compound has a high stability, can maintain a high adsorbing ability for arsenic and the like and a cleaning level for a necessary period or semi-permanently, and can adsorb arsenic and the like in polluted water or polluted soil.
REFERENCES:
patent: 2004-358396 (2004-12-01), None
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K. Fukushi, et al.“Adsorption of arsenic (V) by shwertmannite;”Preprint of 2001 Meeting of The Mineralogical Society of Japan; 2001; p. 71 (1 Sheet.), no month.
K. Fukushi, et al.; “The behavior of As in low crystalline iron mineral during its alteration process;”Preprint of 2001 Meeting of Mineralogical Society of Japan/ Symposium of The Japanese Association of Mineralogists, Petrologists&Economic Geologists; 2001; p. 106 (1 Sheet.), no month.
K. Fukushi, et al.; “Natural attenuation of arsenic at the Nishinomaki abandoned mine district in Gunma prefecture;”Preprint of 2001 Meeting of Atomic Energy Society of Japan; 2001; (1 Sheet.), no month.
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Akita Naoko
Fukushi Keisuke
Ikeda Hodaka
Ito Ken-ichi
Sato Tsutomu
Kratz Quintos & Hanson, LLP
Langel Wayne
Sophia Co., Ltd.
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