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Full wave analysis of stripping chronopotentiometry at scanned deposition potential (SSCP): Obtaining binding curves in labile heterogeneous macromolecular systems for any metal-to-ligand ratio

Abstract : 1 deposition potential (SSCP): obtaining binding curves in labile 2 heterogeneous macromolecular systems for any metal-to-3 ligand ratio. 4 5 Abstract 12 The different deposition potentials applied in Scanned Stripping ChronoPotentiometry 13 (SSCP) probe different values of the free metal and complex concentrations at the 14 electrode surface. The knowledge of these concentrations gives access to a relevant 15 window of the binding curve of a metal to a homogeneous or heterogeneous ligand. 16 Here, a suitable mathematical treatment for the determination of these surface 17 concentrations, when using a mercury thin film rotating disk electrode, is reported. The 18 proposed procedure does not require ligand excess conditions and takes advantage of 19 the knowledge of the free metal ion concentration in the bulk solution provided by the 20 technique AGNES (Absence of Gradients and Nernstian Equilibrium Stripping). It is 21 experimentally shown that the information derived from the SSCP points (i.e. at 22 different deposition potentials in a unique solution) is consistent with the speciation 23 results yielded by the technique AGNES in pertinent solutions prepared within a range 24 of metal-to-ligand ratios. Successful examples with polystyrene sulfonate, Laurentian 25 Fulvic acid and a peat humic acid are reported. It is concluded that, by running 26 consecutively SSCP and AGNES in a single solution, speciation information 27 corresponding to different compositions (i.e. those locally generated at the electrode 28
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Submitted on : Monday, July 20, 2020 - 10:06:57 AM
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José-Paulo Pinheiro, Josep Galceran, Elise Rotureau, Encarna Companys, Jaume Puy. Full wave analysis of stripping chronopotentiometry at scanned deposition potential (SSCP): Obtaining binding curves in labile heterogeneous macromolecular systems for any metal-to-ligand ratio. Journal of Electroanalytical Chemistry, Elsevier 2020, pp.114436. ⟨10.1016/j.jelechem.2020.114436⟩. ⟨hal-02902592⟩

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