[en] In the first part of a series of three publications methodological problems and new applications are discussed. Methodological problems include dynamical techniques, studies on smooth surfaces and others. Recent advances in the monitoring of various metal electrodes, Au, Ag, Ni, Ru, Rh, Cu etc., and of oxide electrodes, RuO₂, TiO₂, NiOOH, are overviewed. (author) 104 refs.; 9 figs

[en] The adsorption of SO₄^2- (HSO₄^-) ions from diluted solutions (10^-6-10^-3 mol dm^-3) on powdered samples of a stainless steel (O8X18H10T used as constructional material in WWER nuclear reactors) was studied by a radiotracer method using ³⁵S labelled sulphuric acid. The observed pH and concentration dependence of the adsorption was explained by the high adsorbability of HSO₄^- ions that exceeds the adsorbability of SO₄^2- species. The sorption of HSO₄^- ions can be described by a logarithmic isotherm. (author) 19 refs.; 15 figs

[en] The adsorption of H₂SO₄ on the surface of powdered samples of O8X18H10T austenitic stainless steel was studied by a radiotracer method using ³⁵S labelled sulfuric acid (10^-6-10^-3 mol dm^-3) in the presence of a great excess of supporting electrolyte (1 mol dm^-3 HClO₄ or 1 mol dm^-3 NaClO₄+HClO₄, pH=2). In accordance with previous findings, the phenomena observed can be interpreted as a specific sorption of HSO₄^-ions, a logarithmic adsorption isotherm with respect to HSO₄^-ions can be fitted to the experimental results. No remarkable potential dependence of the adsorption of HSO₄^- ions was found in the potential range studied (-100+1100 mV). (author) 10 refs.; 7 figs

[en] A measuring method based both on the determination of the activity of the tracer isotope ³⁶Cl and on the control of electrochemical parameters was applied to study the sorption processes of chloride ions on powdered steel samples. The effect of CrO₄^2-, SO₄^2- and ClO₄^- anions on the sorption and desorption properties of chloride anions was investigated. The sorption ability of the anions on the steel sample of type DVO-16 proved to decrease in the following order: CrO₄^2- > Cl^- > SO₄^2- = ClO₄^-. (V.N.)

[en] An electrochemical radioisotope tracer technique was developed for the observation of contamination-decontamination process and corrosion inhibition technologies of nuclear structural materials and coatings. Beta and gamma detection was used for activity measurements. (R.P.) 23 refs

[en] A new tracer technique and a measuring system consisting of electrochemical and nuclear measuring units were developed for the in-situ investigation of corrosion and contamination processes. The adsorption of sulfate ions labelled with sulfur 35 on the powdered surface of austenitic steel 08X18H10T was studied. The kinetics of the sorption, the effect of Na₂CrO₄ and the electrode potential were studied. It can be stated that the Cr³⁺ containing species of the oxide layer play an important role in the selective equilibrium sorption. (V.N.) 20 refs.; 12 figs

[en] The kinetics and mechanism of cobalt sorption onto surfaces of plastic foil, gold and austenitic stainless steel type 08H18N10T used as construction material in WWER type nuclear reactors, were studied in order to obtain information about their contamination and decontamination behaviour. The sorption equilibrium, the potential and pH dependence of the accumulation were investigated using radiotracer technique based on the measurement of the β-radiation of ⁶⁰Co nuclides. It was found that both the character and extent of the sorption depend on the nature of the hydrolytic products of cobalt (Co²⁺, Co(OH)⁺, Co(OH)₂, etc.) and on the quality and pretreatment of the adsorbent. (author) 14 refs.; 13 figs

[en] The applicability of radiotracer methods for the investigation of the contamination and decontamination processes on protective coatings used in nuclear industry is discussed. A distinction is made between organic (polymer) coatings and thin metal layers with respect to the methods used for their investigation. (author) 11 refs.; 2 figs

[en] The sorption of Cl^- and HSO₄^-(SO₄^2-) ions on coatings applicable for the protection of metal parts of nuclear power plants was studied in order to obtain information about their contamination and decontamination behaviour. It was found that both the character and extent of the sorption depend on the nature of the ions and film. (author) 12 refs.; 9 figs