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In dilute buffer solutions, cyclic voltammograms (CVs) of hydroquinone (QH 2 ) and quinone (Q) depends on the buffer capacity (β). The explanation is that the pH changes at the electrode surface cause the electrochemical redox rates of QH 2 and Q rapidly decline and new peaks occur. An electrochemical approach has been developed for measuring β, which requires the introduction of QH 2 or Q into the solution instead of a strong acid or base. Therefore, the approach has potential for measuring the intracellular βi without interference from proton transportation. The approach was successfully applied to measure the β of human saliva.

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