Publication details

A New Method of Apparent Protonation Constant Evaluation from Voltammetric Data



Year of publication 2013
Type Article in Proceedings
Conference XXXIII.Moderní elektrochemické metody, sborník přednášek
MU Faculty or unit

Faculty of Science

Field Electrochemistry
Keywords Electrochemical determination of pKa;linear sweep voltammetry;elimination voltammetry;adenine
Description In general, the determination of apparent protonation constants of organic electroactive substances from polarographic and voltammetric data is based on the dependence of peak potential (Ep) on pH. Then the pKa value is given as an intersection of two lines characterizing a different shift Ep of protonated and unprotonated particles on pH. Due to the fact that both slopes of these lines usually are not very different, the exact assessment of the intersection is problematic. Our new proposed method, which is able to determine pKa values from the Rp (peak resistance) depending on pH, eliminates this drawback.
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