“Fabricación electroquímica de un sensor de bismuto para la determinación de aluminio”.
Ayala Cruz, María Camila
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For the determination of aluminum in solution, chemically modified bismuth (BiE) carbon electrodes were prepared. The modification of the carbon surface was performed through bismuth electrodeposition and through the use of double pulse potential chronoamperometry. The effect of experimental parameters such as: applied potential, bismuth concentration and deposition time was examined in order to find the best experimental conditions and reproducibility of the bismuth film. These parameters were evaluated by a cyclic voltammetry of BiE in a blank solution of acetic acid / sodium acetate buffer, pH 4,50. The determination and quantification of Al+3 was carried out through the formation of a complex in-solution with cupferron; this complex is adsorbed / desorbed on the BiE surface, hence when a potential sweep is performed, it presents a current peak of – 0,60 V vs Ag/AgCl. Experimental variables such as: the effect of the concentration and the pH of the cupferron solution for the determination of the aluminum were also studied and optimized. It was then established that the detection limit for the determination of aluminum was: 0,025 ppb. Furthermore, BiE was characterized using infrared (IR) spectroscopy and UV-VIS spectroscopy