Abstract
Nitrate and nitrite electroreduction was carried out for simulated and real groundwater samples by the chronoamperometric technique, using copper (Cu) and polypyrrole modified copper (Ppy/Cu) electrodes. The Ppy/Cu electrodes were prepared on copper substrate by electrochemical oxidation of pyrrole in salicylic acid and salicylate buffer solutions. The copper electrode showed the best catalytic activity for nitrate reduction, however with a large amount of unwanted nitrite by-product, compared to Ppy/Cu electrodes. The electroreduction of nitrate and nitrite compounds in the groundwater samples using Ppy/Cu electrodes was effectively with a considerable low formation of unwanted nitrite and ammonium products. The modified copper electrodes perform selective and stable catalytic effect on the nitrite reduction. The modification conditions affect the performance of the electrodes. The catalytic performance of Cu and Ppy/Cu electrodes for nitrate reduction was studied by cyclic voltammetry. Nitrate, nitrite and ammonium contamination in groundwater at six polluted areas in Ho Chi Minh City was analyzed, following the AOAC, ASTM, NIOSH standards by photometric and ion-chromatographic methods (NIOSH 6015, NIOSH 6014/ASTM 1607, ASTMD 1426, ASTM 3867).
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