Método eletroquímico para determinação de peróxido de hidrogênio usando sensor fabricado por impressão 3D

Abstract

3D printing is receiving great interest in the field of electrochemistry. The advantages of this include the easy design of new materials, the rapid creation of prototypes and the reduction of waste, since the material used for printing is rationalized. Using commercially available filaments made of polylactic acid / conductive graphene (G-PLA), electrodes were printed which were modified with Fe4[Fe(CN)6]3, known as an excellent electrocatalyst for the electrochemical reduction reaction of H2O2. The modified 3D electrode was successfully applied for the determination of H2O2 residues in milk and also for the analysis of mouthwashes that have H2O2 as a bleaching agent. The analyses were performed using amperometric detection in a batch injection analysis system (BIA). Optimizations were performed for the system in which the responses obtained were reproducible and stable, with a relative standard deviation of 4.23% (n = 10), high analytical frequency (87 h-1), low detection limit 0.111 μmol L-1, recovery values for the samples analyzed above 97%, in addition to good precision and accuracy.