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Effect of Surface‐Active Compounds on the Stripping Voltammetric Response of Bismuth Film Electrodes
Author(s) -
Wang Joseph,
Deo Randhir Prakash,
Thongngamdee Sompong,
Ogorevc Bozidar
Publication year - 2001
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200110)13:14<1153::aid-elan1153>3.0.co;2-i
Subject(s) - bismuth , electrode , stripping (fiber) , adsorption , nafion , anodic stripping voltammetry , pulmonary surfactant , chemistry , inorganic chemistry , voltammetry , materials science , electrochemistry , organic chemistry , composite material , biochemistry
The influence of model surface‐active macromolecules on the stripping voltammetric response of bismuth film electrodes was evaluated. Gelatin, albumin, humic acid, and Triton X‐100 were used as representative surfactants, while lead and cadmium were employed as test metal ions. The adsorption of these surfactants onto the bismuth electrode caused a gradual decrease of the stripping peaks. The faster and larger suppressions observed at the bismuth electrode (compared to the mercury one) in the presence of albumin and Triton X‐100 reflect differences in the adsorption kinetics and equilibrium of these surfactants at these electrodes. The surfactant interference at bismuth stripping electrodes can be circumvented using a permselective/protective Nafion coating. The effective resistance to surfactant effects makes the Nafion‐coated bismuth electrode very attractive for practical stripping applications. A Nafion‐modified stripping electrode is applied for measurements at large sample‐instrument distances.