Abstract
AbstractUnder the influence of previously published and some new theoretical results, potential‐ dependent adsorption and desorption of model electroinactive surfactants Triton X‐100 (T‐X‐100 or polyethylene glycol p‐(1,1,3,3‐tetramethylbutyl)‐phenyl ether) and sodium dodecyl sulfate (SDS) on the static mercury drop electrode (SMDE) were studied by square‐wave voltammetry (SWV). Although (according to the theory) the resulting current – potential curve should consist of two highly separated peaks, only desorption signal could be seen on each experimentally obtained voltammogram, most probably because of the limitations concerning the available potential range. Different properties of the recorded peak are in good agreement with the theory indicating that square‐wave voltammetry could be treated as a potential tool for tensammetric studies of electroinactive surface active substances.
Highlights
Electroanalytical studies of adsorption processes at electrode surfaces have been in focus for many years
According to the published theoretical results [27], a square-wave voltammogram of an electroinactive surfactant is generally characterized by a well defined desorption peak, assuming that scanning in the negative direction starts near the potential of zero charge whereas the whole process could be described by equation 1
From the theoretical and experimental results, it follows that a pronounced electrode response is to be expected when square wave voltammogram of an electroinactive surfactant is recorded
Summary
Electroanalytical studies of adsorption processes at electrode surfaces have been in focus for many years. Alternating current voltammetry is the most commonly used technique for the study of surface processes without electron transfer [1,12,13,14,15,16]. Electroanalysis of electroinactive surfactants is based on recording of their influence upon the electrode double layer structure. SW voltammetry is a powerful electrochemical technique for kinetic and mechanistic studies as well as analytical examinations of faradaic processes [20,22,23,24,25]. In the previous article from our laboratory [27] a basic theory of square wave voltammetry of surface-active, electroinactive compounds was developed. Experimentally obtained SW current - potential curves of model electroinactive surfactants Triton X-100 and sodium dodecyl sulfate will be presented and treated in the light of previously published [27] and some new theoretical results
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