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This article describes the electrochemical behavior of P-carboxyethylgermanium sesquioxide (Ge-132) on mercury electrodes in weakly acidic solution. The Ge-132 exhibits two well-defined cathodic waves in linear-sweep voltammetry and polarography. The first wave in a voltammogram of Ge-132 is a simple two-electron reduction and exhibits the property of adsorption. From chronoamperometry, the reaction in the second wave, however, proves to be an ECE mechanism and ultimately yields metallic germanium and propionic acid. The determination of small amounts of Ge-132 is investigated by differential pulse polarography in an acetate buffer. The detection limits of ~e -1 3 2 are below 0.2 pmol dm-3.