Chronopotentiometry with programmed current

Abstract

An instrument has been constructed for chronopotentiometry with current that varies as any selected power of time, tq, where gcan lie anywhere between 0.2 and 5.0. The ambiguity due to charging current is minimized by an initial brief operation at constant current. The determination of reducible species alone or in the presence of other species can be carried out to concentrations as low as 2.5 X M. Relative standard deviations are of the order of 1% at 5 X M.

A highly accurate, inexpensive procedure for computing integral transformation kernel and its moment integrals for cylindrical wire electrodes

“…Such a variant of chronopotentiometry has been considered advantageous (over constant current chronopotentiometry) by a number of authors (see, for example, Refs. [21][22][23][24][25][26]), but the relevant theory for cylindrical wire electrodes still appears unavailable, with the exception of the case of q = 1/2 [21]. There have been very few attempts to obtain approximate expressions for /(h) and its moment integrals.…”

Enhancing the sensitivity of potential step voltammetry using chemometric resolution

“…There are two kinds of methods for reducing the inuence of the charging current on the faradaic current. One is implemented by experiment with the benet of real-time correction for the sampling current, such as circuitry design, 7 background subtraction, 8,9 microelectrode, [10][11][12] differential pulse voltammetry and staircase voltammetry. [13][14][15] Such methods, however, may not sufficiently reduce the effects of the charging current.…”