Original scientific paper

On the Adsorption of Lead Iodide on the Mercury Electrode

I. Filipović ; Institute of Inorganic and Analytical Chemistry, University of Zagreb
M. Tkalčec ; Institute of Inorganic and Analytical Chemistry, University of Zagreb
B. Mayer ; Institute of Inorganic and Analytical Chemistry, University of Zagreb
I. Piljac ; Institute of Inorganic and Analytical Chemistry, University of Zagreb

Abstract

The adsorption of lead iodide on the mercury electrode was
studied by the potential-sweep chronoamperometric method, by
recording of polarographic current-time curves and by the
measurement of the differential capacity of the electric doublelayer.
From the dependence of height and potential of the adsorption
peak on' the concentration of iodide the solubility product
of PbI2 was calcula ted (Ks = 1.3 X 10-8). From polarographic current-
time curves it could be concluded that the adsorption process
is controlled by diffusion and the surface excess was calculated
rs= 4.3 X 10-10 mole/cm 2). The kinetics of the adsorption process
is potential dependent. The measurements of the differential capacity
have shown that the adsoprtion of lead occurs after previous
adsorption of iodide ion and that in solutions of h igh iodide concentration
the compact adsorption layer is destroyed.

Keywords

Hrčak ID:

207949

URI

https://hrcak.srce.hr/207949

Publication date:

1.10.1969.

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