Viscosity effects in square wave polarography polyethylene glycols—Cd2+, Tl+—system
✍ Scribed by T. Maliński; Z.P. Zagórski
- Book ID
- 103062370
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 551 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
In both the dc polarography and in the square wave polarography, the Stokes-Einstein-IlkoviE equation connecting polarographic current and viscosity of the solution, is valid only in the case of monomeric solutions. In solutions of polymers, the polarographic diffusion current is higher than it would be expected from the macro-viscosity. The phenomenon is explained by the fact of micro-viscosity which is lower than macro one and controls the diffusion of small species like inorganic cations. They do not "see" long chains and coils of polymers. Paper discusses the phenomenon from different points of view: electrochemical (filling the gap in general application of square wave polarography) and physicochemical (diffusion of cations as a means of investigation of the structure of polymeric solutions). Conclusions of the oatnz are also imaortant for radiation ohemistrv where discussion of diffusion of small species cannot be hone in terms of macro-viscosity. r