Measurement of Np(IV) solubility with Ca and Si in the high pH region

Fujiwara, Kenso ; Kohara, Yukitoshi*; Okazaki, Mitsuhiro*; Suzuki, Yasuyuki*

The stability constants of Np(IV) with Ca and Si are measured by solubility method. In the case of coexistence of Ca or Si under high pH region, the solubility of tetravalent actinide was higher than the case of without Ca or Si in a recent study. However, in the case of Np(IV), the experiment was not measured. Therefore, the solubility of Np(IV) was measured with Ca or Si in the high pH region, the stability constants of (Ca $_{4}$ Np(OH) $_{8}$ $^{4+}$ ) and Si of Ca and the Np and complex (Np(OH)nSi $_{2}$ O $_{3}$ (OH) $_{4}$ etc) was calculated by solubility of Np(IV).

Language	:	Japanese
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Meeting title	:	日本原子力学会2009年春の年会
Held date	:	2009/03
Location (city)	:	東京
Location (country)	:	日本
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Keywords	:	no keyword
Research Facility	:	QUALITY(地層処分放射化学研究施設)
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Registration No. : BB20083223
JAEA Abstracts No. :
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