Gold-plated carbon paste electrodes for anodic stripping determination of arsenic

The applications of gold-plated carbon paste electrodes in anodic stripping voltammetry have been studied in an effort to develop a simple and effecti ve method for the determination of arsenic in water samples. The investigat ions performed included the choice of supporting electrolyte composition, t he optimisation of important experimental parameters, search for appropriat e procedure to reduce As(V) to As(III), and some tests of practical applica bility of the method, including interference studies. Under optimised condi tions, the signal of As was linear within 5-50 mu g l(-1) with a detection limit of about 1 mu g l(-1) As (deposit ion time 10 min). Common elements o r ions did not interfere except for Cu(II). The analytical performance of t he method has been tested in recovery measurements with model solutions.