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Complexation of Protactinium (V) with nitrilotriacetic acid: a study at tracer scale

Abstract

Complexation of Pa(V) with nitrilotriacetic acid (NTA) in aqueous solution (1 M (〖Na,H)ClO〗_4) was studied by solvent extraction at different acidities (pcH = 0.6; 1.0; 2.0 and 2.5) with the element at tracer scale (C_Pa<〖10〗^(-10) M). Two types of metal-ligand complexes were identified in solution: (1:1) and (1:2) complexes. The mean charge of the two successive complexes formed in aqueous phase was deduced from the variations of Pa distribution coefficient as function of acidity. The apparent formation constants of PaO(NTA) and 〖PaO(NTA)〗_2^(3-) were also determined from solvent extraction experiments. Capillary electrophoresis coupled with inductively coupled plasma mass spectrometry (CE-ICP-MS) experiment confirmed the charge -3 of the complex of maximum stoichiometry.

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Publication details

The article was received on 29 Nov 2017, accepted on 08 Feb 2018 and first published on 09 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ04683A
Citation: New J. Chem., 2018, Accepted Manuscript
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    Complexation of Protactinium (V) with nitrilotriacetic acid: a study at tracer scale

    C. Luchini, S. LEGUAY, J. Aupiais, C. CANNES and C. Le Naour, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04683A

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