A contribution to the characterisation of mercury- and bismuth film carbon paste electrodes in stripping voltammetry

Abstract

The results are summarised on the continuing characterisation of mercury- and bismuth-film-plated carbon paste electrodes for electrochemical stripping analysis in the differential pulse anodic stripping voltammetric (DPASV) mode. Both types of electrodes, denoted as MF(C/SO) and BiF(C/SO), were based on silicone oilcontaining carbon paste support with the respectice metal film plated "in situ". MF(C/SO) and BiF(C/SO) were first studied with respect to their polarisability in a variety of supporting electrolytes such as diluted mineral acids, some acid or basic buffers, and highly alkaline media with sodium hydroxide. Stripping characteristics of numerous metals (Mn, Zn, Pb, Cd, Tl, Bi, Sb, In, Sn, and Cu) detectable using DPASV were also investigated. The whole study has provided some additional and supplementing information to the previous investigations on the two types of film plated carbon paste electrodes.