Interaction of Neptunium(V) with Polyacrylic Acid

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  • Kubota Takumi
    Department of Quantum Science and Energy Engineering, Faculty of Engineering, Tohoku University
  • Tochiyama Osamu
    Department of Quantum Science and Energy Engineering, Faculty of Engineering, Tohoku University
  • Yamazaki Hiromichi
    Department of Quantum Science and Energy Engineering, Faculty of Engineering, Tohoku University
  • Sato Nobuharu
    Department of Quantum Science and Energy Engineering, Faculty of Engineering, Tohoku University

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Other Title
  • ポリアクリル酸とネプツニウム(V)の相互作用
  • ポリアクリル酸とネプツニウム(5)の相互作用
  • ポリアクリルサン ト ネプツニウム 5 ノ ソウゴ サヨウ

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Abstract

For the quantitative description of the interaction of actinoids with humic substances, it is necessary to clarify the effects of both polyelectolyte and heterogeneous nature of humic substances. To estimate these effects separately, polyacrylic acid has been selected as representative of well-defined, homogenous polymeric weak acids, and its interaction with Np(V) has been investigated by a solvent extraction method. By expressing the effective concentration of the complexing ligand by the concentration of ionized carboxylate groups, the apparent complex formation constant has been obtained at several pH, ionic strength and average molecular weights. The results indicated that the apparent complex formation constant varied with the degree of ionization(α) of polyacrylic acid and that the manner of variation resembled that of its apparent proton association constant.

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