Sorption behavior of Np(V) on illite, shale and MX-80 in high ionic strength solutions

Nagasaki, Shinya*; Saito, Takumi; Yang, T.*

Sorption of Np(V) on illite, shale and MX-80 under oxidizing conditions were first studied in two types of high ionic strength solutions: (1) a reference brine solution (SR-270-PW) with an ionic strength (I) of 6.0 M, and (2) Na-Ca-Cl solutions (with different Na/Ca molar ratios and different ionic strengths, up to a maximum of 4.6 M). The effects of pHc, Na/Ca ratio, and ionic strength on sorption in Na-Ca-Cl solutions were investigated. The Kd values increased with increasing pHc and Na/Ca ratio for all sorbents studied. The Kd values on illite and shale were independent of the ionic strength over the range 0.10-4.6 M, and the Kd value on MX-80 was independent of ionic strength greater than 1.0 M. The Kd values and the sorption isotherms in both SR-270-PW and Na-Ca-Cl solutions were also studied.

Language	:	English
Journal	:	Journal of Radioanalytical and Nuclear Chemistry
Volume	:	308
Number	:	1
Pages	:	p.143 - 153
Publication Year/Month	:	2016/04
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Paper URL	:	https://doi.org/10.1007/s10967-015-4332-x
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Keywords	:	no keyword
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Registration No. : AA20150097
JAEA Abstracts No. : 44000966
Paper Submission No. : 17654

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