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ニッケルの溶解度に及ぼす塩化アンモニウム濃度の影響

Dependence of Concentration of Ammonium Chloride on Solubility of Nickel

宮本 真哉*; 佐藤 光吉*; 三原 守弘  

Miyamoto, Shinya*; Sato, Mitsuyoshi*; Mihara, Morihiro

本研究においては実験的にアンモニアのニッケルの溶解度への影響を調べるためにセメント系材料の影響を受けた地下水同様にpHの高い条件において,アンモニア濃度をパラメータとした溶解度試験を実施し,既存の熱力学データを用いてニッケルの溶解度の評価を行った。その結果,塩化アンモニウムの濃度が1mol/kgを超えるとニッケルの溶解度が3$$sim$$4桁大きくなることが示された。さらには,この傾向は既存のニッケルのアンミン錯体のデータを考慮することによって説明することができる。

It is planning that radioactive wastes of high alpha concentration generated from reprocessing plant of spent nuclear fuel will be disposed in deep underground repository in Japan. Using the nitrate acid in the reprocessing process, some of radioactive wastes include lots of nitrate salts. The solubility of nitrate salts is very high and they might easily dissolve in groundwater in the repository. In the repository, many steels also will be disposed and nitrate will be reduced to ammonium ion by the interaction of steel. In this study, first the solubility experiments of nickel were performed to evaluate the effect of ammonium ion on solubility. Next the geochemical modeling also was carried out to explain results of solubility experiments using published thermodynamic data of nickel and ammonia. Under conditions of more than 1mol/dm$$^{3}$$ of ammonium chloride, the enhancement of solubility of nickel was observed. It showed 2 or 3 orders magnitude of higher than those of less than 1mol/dm$$^{3}$$ of ammonium chloride. These data were explained by geochemical modeling using data of ammine complex.

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