Abstract

This paper describes the preparation, characterization and electroanalytical application of a composite consisting of titanium phosphate modified with nickel hexacyanoferrate. Titanium phosphate (TiPh) was formed from the reaction of titanium isopropoxide with H₃PO₄ and deionized water. Next, the reaction of TiPh was performed with a metal ion (Ni⁺²) and potassium Hexacyanoferrate, designated as TiPhNIHCF. Spectroscopic techniques such as vibrational spectroscopy, X-ray diffraction (XRD), diffuse reflectance and cyclic voltammetry were used to characterize the TiPh and TiPhNiHCF. The graphite paste electrode containing TiPhNiHCF exhibited a redox couple with average potential (E^q’) of 0.61V vs Ag/AgCl (KNO₃ 1.0 mol L^-1; v = 20 mV s^-1) attributed to redox process Fe^II(CN)₆/Fe^III(CN)₆. The redox couple presents a sensitive response for determining dipyrone. The system showed a detection limit of 3.75 x 10^-4 mol L^-1 and standard deviation of 1.8 % for n = 3, with an amperometric sensitivity of 34.84 mA / mol L^-1. The modified electrode was electrochemically stable and showed good reproducibility.

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