Measurement of electrode potential in oil in water emulsions
Keywords:oil in water emulsion, polarization curves, reference electrodes, cell geometry
This study was performed taking into account the problems found when common reference electrode systems like SCE with a satured KCl bridge are used. Tests were carried out to establish the most appropriate reference electrodes for measurement of electrode potentials in emulsions kerosene in water. Four reference cells were tested, looking for compatibility between aqueous and oil phases inherent to the nature of these emulsion systems. The cell SCE/Sat KCl/Agar 3% + 0,1 M KCl// was taken as reference cell. The corrosion systems studied were aqueous solution of satured KCl, aqueous solution containing 1.000 ppm of anionic surfactant (GR-7M) and kerosene in water emulsions with 5, 20, 40 and 60 weight per cent. The cell //AgarGR7M (1%)/GR7M (1%)/SCE was chosen due to its long stability with time and small joining potentials.
Sawyer, D. T. y J. L. Roberts. Experimental Electrochemistry for Chemists. New York. John Wiley & Sons. 1987.
Ives, D. y G. Janz. Reference Electrodes: Theory and Practice. New York. Academic Press. 1969.
Watson, S. W. y B. W. Madsen. “Aplicability of reference electrode types in transient electrochemical experiments”. En: Corrosión (NACE). Vol. 48. No. 9. 1992.
Jasinski, R. J. y R. D. Efird. “Electrochemical corrosion measurements in crude oil”. En: Corrosión (NACE). Vol. 43. No. 8. 1987. p. 476.
Coetzee, J. F. and C. W. Gardner. “Teflon double-junction reference electrode for use in organic solvents”. En: Analytical Chemistry. Vol. 54. No. 14. 1982. p. 2.625.
Retamoso, C. et al. Procesos electroquímicos en emulsiones. Proyecto UIS-ICP, 1993.
Becher, P. “Dielectric properties of emulsions and related systems”. En: Enciclopedia de las emulsiones. 1987.
Peña, D. Comportamiento electroquímico de un acero AISI 1020 en emulsiones blancas inversas. Tesis de Maes-tría. Universidad Industrial de Santander. s. E. 1994.
Echeverría, F. Determinación de velocidades de corro-sión en sistemas emulsionados aceite en agua. Tesis de Maestría. Universidad Industrial de Santander. 1995.
Izutsu, K. et al. “Experimental studies of the liquid junction potential between electrolyte solutions in diferent solvents. I. Water-Organic solvent junctions”. En: Bulletin of the Chemical Society of Japan. Vol. 51. No. 3. 1978. p. 783.
Diggle, J. W. y A. J. Parker. “Liquid junction potencials in electrochemical cells involving a dissimilar solvent junction”. En: Australian Journal of Chemistry. Vol. 27. 1974. p. 1.617.
Adams, R. N. Electrochemistry at solid electrodes. New York. Marcel Denker Inc. 1969.
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