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Probing the speciation of quaternary ammonium polybromides by voltammetric tribromide titration

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Abstract

The speciation of quaternary ammonium polybromides (QBr2n+1) was quantitatively determined by voltammetric tribromide titration on a Pt ultramicroelectrode (UME). The concentration of Br3 in a QBr2n+1-water mixed solution (QBr2n+1-WMS) was electrochemically estimated by measuring the steady state current associated with the electro-reduction of Br3 in a linear sweep voltammogram (LSV). The pBr3 titration curves of QBr2n+1-WMSs show 2–4 plateaus, each of which relates to the formation of QBr2n+1 from Br3 and Br2. The values of pBr3 at these plateaus can be regarded as corrected equilibrium constants of QBr2n+1, Keq(n), which is Keq(n)/γ±, where γ± is a mean activity coefficient in QBr2n+1-WMS. Based on the estimated Keq(n), fractional diagrams of QBr2n+1 were obtained, which gave information on QBr2n+1 speciation.

Graphical abstract: Probing the speciation of quaternary ammonium polybromides by voltammetric tribromide titration

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Publication details

The article was received on 25 Mar 2018, accepted on 24 Jul 2018 and first published on 25 Jul 2018


Article type: Communication
DOI: 10.1039/C8AN00560E
Citation: Analyst, 2018, Advance Article
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    Probing the speciation of quaternary ammonium polybromides by voltammetric tribromide titration

    H. Kim, D. Jung, J. Hwang, J. Chae and J. Chang, Analyst, 2018, Advance Article , DOI: 10.1039/C8AN00560E

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