A simple method for the optimization of the decay time in pulse polarography

A simple method for optimization of the minimum decay time, previous to the sampling time of the polarographic current, is described. The former should make compatible two requisites: it should be short enough for obtaining the maximum value of the faradaic current and long enough for the minimum or null value of the double layer decay current. The method is performed with the pulse polarograph only, without ancillary instruments, is fast and its accuracy is fairly comparable with earlier methods, which were more accurate but by far more involved to perform.

Theory of polarography with elimination of some currents

A method for the elimination of various components of the polarographic current is proposed, based on its differentiation and/or integration with respect to time forming a linear combination of the results with the original current. A linear combination of n different functions can be used to eliminate n - 1 current components. Examples for the elimination of the charging, diffusion, and kinetic current are given, and the possibilities of realization and utilization of the new method are discussed.

Analysis of the anodic processes of 8-hydroxyquinoline in AcOH-AcONa buffer on mercury

Polarographic current-potential characteristics for the anodic behaviour of 8-hydroxyquinoline (QH) in a pH ~ 5 aqueous AcOH-AcONa buffer have been examined in detail at low concentrations. The electrode reaction is 2 Hg + 2 QH ⇋ Hg2Q2 + 2 H+ + 2 e. The study of the polarographic wave has been performed introducing the Frumkin isotherm in the treatment of adsorption. Also, the inhibition of electrode process due to the films formed on electrode surface has been discussed.