The Chemistry of Protactinium. IV : On the Absorption Spectra of Tetravalent Protactinium in Aqueous Solutions

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概要

• 論文の詳細を見る

• The liquid zinc amalgam method was developed as a rapid procedure for the reduction of pentavalent protactinium. Several minutes were sufficient for the complete reduction of 4.2×10^<-4>M pentavalent protactinium in both hydrochloric and sulfuric acid solutions. The stability of tetravalent protactinium in these media was investigated by spectrophotometry. Re-oxidation occurred gradually, even in the absence of atmospheric oxygen, and amounted to 8% in 15 hr. These results may be understood in terms of the slow rate of the (chemical formula) reaction. The formation of sulfato complexes of tetravalent protactinium was inferred by spectrophotometry with relation to the similarity of the electronic structure between Pa^<4+>(5f^1) and Ce^<3+>(4f^1).

• 東北大学の論文

著者

• Mitsuji Toshikazu

  The Research Institute For Iron Steel And Other Metals

関連論文

• The Chemistry of Protactinium. III : A Study of the Sulfate Complex of Protactinium(V) by the Solvent Extraction Technique Using TTA as the Chelating Agent
• The Chemistry of Protactinium. V : The Separation of Pa(IV) and Pa(V) by Co-precipitation with Thorium Fluoride
• The Chemistry of Protactinium. VI : A Study of the Sulfato-Complex of Pa(IV) by Means of TTA-Benzene Extraction
• The Chemistry of Protactinium. IV : On the Absorption Spectra of Tetravalent Protactinium in Aqueous Solutions

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