Abstract
The electrochemical reduction of Pd(II)—ethanolamine complex on mercury surface is studied. It is found that this process is an irreversible one. With regard to the electrochemical reaction orders, we find that the reduction is through an adsorptive intermediate. A mechanism which includes adsorption—desorption equilibrium steps is proposed. It describes the observed i- E curves satisfactorily. The computed adsorption equilibrium constants show that the adsorption of Pd(II)—ethanolamine complex on mercury surface is much stronger than that of ethanolamine. The effects of surface active material (Triton X-100) on the complex reduction are also investigated. It is concluded that Triton X-100 competes for adsorption sites on mercury surface which results in a shift of the reduction potential.
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