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

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Abstract

Complexation of Pa(V) with nitrilotriacetic acid (NTA) in aqueous solution (1 M (Na,H)ClO4) was studied by solvent extraction at different acidities (pcH = 0.6; 1.0; 2.0 and 2.5) with the element at the tracer scale (CPa < 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 a function of acidity. The apparent formation constants of PaO(NTA) and PaO(NTA)23− were also determined from the solvent extraction experiments. Capillary electrophoresis coupled with inductively coupled plasma mass spectrometry (CE-ICP-MS) experiments confirmed the charge −3 of the complex of maximum stoichiometry.

Graphical abstract: Complexation of protactinium(v) with nitrilotriacetic acid: a study at the tracer scale

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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, Advance Article
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    Complexation of protactinium(V) with nitrilotriacetic acid: a study at the tracer scale

    C. Luchini, S. Leguay, J. Aupiais, C. Cannes and C. Le Naour, New J. Chem., 2018, Advance Article , DOI: 10.1039/C7NJ04683A

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