A monolayer of 1:12 phosphomolybdate (PMo12) was modified electrochem. on a glassy C electrode and its electrochem. behavior was studied by cyclic voltammetry (CV). The PMo12 film is adsorbed strongly on the surface of glassy C electrodes. H+ ions in the solution plays an important role in the electrochem. processes of PMo12 film modified electrodes, whereas other anions, such as Cl-, NO3-, SO42-, ClO4- and PO43-, etc., do not take part in the processes. The stability of PMo12 film modified electrodes during CV scanning is quite good.

Key words: OXIDATION REDUCTION REACTION, HETEROPOLYACID, MOLYBDATE, PHOSPHATE, MEMBRANE ELECTRODES, ELECTROCHEMICAL REACTION, CHEMICAL MODIFIED ELECTRODE, CYCLOVOLTAMGRAPH