The role of H+ on the steady-state voltammetric limiting current (IL) of weak acid (HA)
reduction was studied considering results from either lactic acid or acetic acid solutions at
constant pH. For solutions with pH> pKa or pH≅ pKa the [H+] effect on the IL vs cHA slope
was important even when the H+ current contribution was minor. In contrast, when the pH≪
pKa high H+ current contributions were found; nevertheless the IL vs cHA slope was almost
insensitive to pH. A general relationship between IL and cHA was derived considering both …