engleski

Effects of natural and synthetic surface active substances on the electrochemical reduction of cadmium in natural waters

Effects of surface active substances, natural and synthetic, in selected samples of seawater, river water and industrial effluents on the oxidation-reduction processes of cadmium have been studied by electrochemical methods and compared with the behaviour of different model compounds. Kinetic parameters, transfer coefficient α and apparent standard rate constant of the cadmium electrode reaction have been estimated from the shape and the height of the corresponding differential pulse voltammograms using theoretical curves obtained by digital simulation of the electrode process. The measure of the inhibition effect of surface active substances on the electrode reaction of cadmium was expressed in terms of the ratio of the rate constants determined in the presence and in the absence of surface active substances.It was found that the degree of inhibition depends on the concentration and type of surface active substances and on the pH of solution.

adsorption effect on electrode reduction of cadmium ; electrochemical environmental analysis ; surface active substances in seawater ; freshwater and industrial effluents

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