https://doi.org/10.1351/goldbook.S06132
In ac
polarography
, differential pulse polarography
, derivative polarography
, square-wave polarography
, and similar techniques, the maximum value of the component of the current that is associated with the presence of a substance B. Normally this component of the current is faradaic, and the maximum arises because the rate of variation (with applied potential
) of the rate of the charge-transfer process passes through a maximum. Similar maxima arise when this component is non-faradaic (and when B is surface-active rather than electroactive). In a case known to be of the latter type, the term apex current
is recommended as being more specific.