This review presents the preparation and use of clay modified electrodes with emphasis on analytical applications. Besides, some investigations on ion-exchange and sorption mechanisms are outlined. Expected prospects of clay modified electrodes in the field of electrochemistry are discussed briefly.

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The binding of Hg(I1) with humic acid, incorporated into the carbon paste electrode, was verified. This modified humic acid electrode was used for the trace determination of Hg(I1). The differential-pulse voltammetry on the electrode modiiied with humic acid yielded good performance over the concentration range 5 X lo-* -5 X lo-' M Hg(1I). Only Cu(I1) interferes with the determination.

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