Collect. Czech. Chem. Commun. 2009, 74, 1309-1321
Published online 2009-09-03 22:13:52

Adsorption of tetramethylthiourea in concentrated NaClO4 solutions

Dorota Sieńko*, Dorota Gugała-Fekner, Jolanta Nieszporek, Zygmunt Fekner and Jadwiga Saba

Department of Analytical Chemistry and Instrumental Analysis, Faculty of Chemistry, Maria Curie-Skłodowska University, Maria Curie-Skłodowska Sq. 3, 20-031 Lublin, Poland


Tetramethylthiourea electrosorption behaviour on the mercury electrode in 2, 3 and 4 mol l–1 NaClO4 was determined by means of double-layer differential capacity measurements. The relative surface excess Γ′ of the adsorbate calculated from the surface pressures depended on the NaClO4 concentration. A clear influence of NaClO4 concentration appeared in the changes of interaction parameter A obtained from the Flory–Huggins isotherm and in the permittivity parameter of the inner layer.

Keywords: Differential capacity; Adsorption isotherm; Electrostatic parameters; Tetramethylthiourea; Mercury electrode.

References: 28 live references.