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A novel fused-silica capillary dropping mercury electrode with long drop-time and its application on determination of critical micelle concentration

J. Součková, J. Skopalová, L. Muller, M. Vymětalíková, P. Barták

. 2011 ; 84 (1) : 187-191. [pub] 20110113

Jazyk angličtina Země Anglie, Velká Británie

Typ dokumentu časopisecké články, práce podpořená grantem

Perzistentní odkaz   https://www.medvik.cz/link/bmc12027055

A novel long drop time mercury electrode has been constructed from common fused-silica capillary (50 μm I.D., 360 μm E.D.). Proposed device provides reproducible mercury drops with typical lifetime 40-120 s. The electrode was used for a set of electrocapillary measurements aimed at determination of critical micelle concentration of anionic surfactants by a convection controlled drop-time technique. A critical micelle concentration of sodium dodecyl sulfate 5.6 ± 0.4 mmol L(-1) and 4.3 ± 0.4 mmol L(-1) were obtained in 1 mmol L(-1) and 5 mmol L(-1) phosphate buffer (pH 7.0), respectively. The values were comparable to those obtained from conductometric measurements under the same conditions (7.0 ± 0.1 mmol L(-1) and 5.2 ± 0.1 mmol L(-1), respectively) and the difference was explained in accordance with theory of hemi-micelle formation.

Citace poskytuje Crossref.org

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