A form of adsorptive pre-wave in a sampled dc polarography on a static mercury drop electrode

 Šebojka Komorsky-Lovrić*, Milivoj Lovrić

Center for Marine and Environmental Research, "Rudjer Bošković" Institute,P.O. Box 180, 10002 Zagreb, Croatia

 

 

Abstract

Theoretical analyses show that in a sampled dc polarography on the static mercury drop electrode the response may consist of a pre-wave and a main wave that are separated by a minimum. This is a general characteristic of electrode reactions complicated by strong adsorption of the product. A steep pre-wave and the minimum are the indications of Frumkin isotherm. A flat plateau of the pre-wave is a special case of the steep plateau which appears at lower reactant concentrations. If the adsorption is weak, the pre-wave and the main wave are usually merged into a single wave.

Keywords: polarography, adsorption, mercury electrode.

 

Texto disponível em PDF

Full text only in PDF format

 

 

References

1. J. Heyrovsky, J. Kuta. Principles of polarography, Academic Press, New York, 1966, p. 287.        [ Links ]

2. Z. Galus, Fundamentals of electrochemical analysis, II ed., Ellis Horwood and Polish Scientific Publishers, New York, Warsaw, 1994, p. 481.

3. M. Zeli, M. Lovri;, Electrochim. Acta 35 (1990) 1701-1706.

4. M. Lovri, Š. Komorsky-Lovrić, Langmuir 11 (1995) 1784-1790.

5. M. Lovrić, J. Electroanal. Chem. 465 (1999) 30-36.

6. J.E. Anderson, A.M. Bond, R.D. Jones, R.J. O^,Halloran, J. Electroanal. Chem. 130 (1981) 113-122.

7. P. Delahay, I. Trachtenberg, J. Am. Chem. Soc. 79 (1957) 2355-2362.

 

*Corresponding author. E-mail address: slovric@rudjer.irb.hr