The Chemistry of Protactinium. VI : A Study of the Sulfato-Complex of Pa(IV) by Means of TTA-Benzene Extraction

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概要

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• The behavior of Pa(IV) during extraction with TTA was investigated in perchlorate, chloride, and sulfate solutions (pH 0.4-1.1). In perchlorate and chloride solutions, the extraction equilibrium may be written as : Pa(OH)_2^<2+>+4HT〓PaT_4+2H_2O+2H^+ On the other hand, the extraction by TTA from the sulfate solution may be described as : Pa(SO_4) (OH)^++4HT〓PaT_4+HSO_4^-+H_2O+2H^+ Therefore, the formation of the sulfato-complex of Pa(IV) is considered to occur as follows : Pa(OH)_2^<2+>+HSO_4〓Pa(SO_4) (OH)^++H_2O The equilibrium constant for the above reaction has been determined to be 320 at the ionic strength of 0.50 (temperature : 10±0.5℃).

• 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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