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Selenium Sorption in a Sedimentary rock/saline Groundwater System and Spectroscopic Evidence

Published online by Cambridge University Press:  21 March 2011

X. Xia ,
G. Kamei ,
K. Iijima ,
M. Shibata ,
T. Ohnuki  and
N. Kozai
X. Xia
Affiliation:
Waste Management and Fuel Cycle Research Center, Japan Nuclear Cycle Development Institute, Ibaraki 319-1194, Japan
G. Kamei
Affiliation:
Waste Management and Fuel Cycle Research Center, Japan Nuclear Cycle Development Institute, Ibaraki 319-1194, Japan
K. Iijima
Affiliation:
Waste Management and Fuel Cycle Research Center, Japan Nuclear Cycle Development Institute, Ibaraki 319-1194, Japan
M. Shibata
Affiliation:
Waste Management and Fuel Cycle Research Center, Japan Nuclear Cycle Development Institute, Ibaraki 319-1194, Japan
T. Ohnuki
Affiliation:
Advanced Science Research Center, Japan Atomic Energy Research Institute, Ibaraki 319-1195, Japan
N. Kozai
Affiliation:
Advanced Science Research Center, Japan Atomic Energy Research Institute, Ibaraki 319-1195, Japan
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Abstract

Sorption of selenium (Se) was studied by batch technique by using sedimentary rock samples andcorresponding saline groundwater from Horonobe underground research laboratory (URL)site under reducing condition. Spectroscopic analyses were performed by X-ray absorption near-edge structure (XANES) afterthe sorption experiments to identify the oxidation states of Se on the sedimentary rock. It issuggested thatthe dominant parameters affecting the Se sorption are iron-bearing minerals, especially exchangeable Fe and pyrite, and organic matters. Most of the Se sorbed on the sedimentary rock was Se(0) inthe case of natural saline groundwater, at least at relatively high Se concentration, while only part of the Se was Se(0) in caseof the synthetic groundwater, which contains no organic matters. Incorporationinto pyrite could be the sorption mechanism of Se(0).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 932: Symposium – Scientific Basis for Nuclear Waste Management XXIX , 2006 , 17.1
Copyright
Copyright © Materials Research Society 2006

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