Cathodic stripping voltammetry of pyridine-2-thiol and some related compounds

The cathodic stripping voltammetric behaviour of pyridine-2-thiol and some related heterocyclic thiols has been studied at a static mercury drop electrode. The influence of substituents on the adsorption of these compounds on the mercury electrode, and the nature of the different thiolates responsible for the subsequent stripping signals have been investigated. Differential-pulse cathodic stripping voltammetry was used to establish linear calibration ranges for the compounds studied. The use of a pre-concentration time of 240 s in open circuit allowed a detection limit of 8.0 × 10–9M to be attained for pyridine-2-thiol