Video Experimental Relacionado

Updated: Jan 8, 2026

Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

Published on: February 16, 2022

Evaluación de un electrodo modificado con un complejo de cobre(I)-biquinolina para la detección electroquímica de

Natalia P Martínez¹, Verónica Valladares², Colin Poblete²

¹Departamento de Química, Universidad Técnica Federico Santa María, Av. Vicuña Mackenna 3939, San Joaquín, Chile.

|December 23, 2025

Abstract:

Glassy carbon electrodes were modified with a small amount of Nafion and a novel copper (I)-biquinoline coordination compound. Their electrochemical properties were evaluated for the detection and quantification of nitrite in aqueous media. The surface of the resulting stable and reproducible electrodes was characterized by Raman spectroscopy and atomic force spectroscopy (AFM). Electrochemical measurements in Britton-Robinson buffer revealed an increased current response and a decrease in onset potential for nitrite reduction compared with bare glassy carbon electrode. The modified electrode exhibited a linear response (R² = 0.998) a detection limit of ca 0.04 μM and recovery values of 88.9 ± 0.05 % in model water, 43.2 ± 0.04 % in drinking water and 23.9 ± 0.31 % in well water. Chronoamperometric measurements at -0.86 V (vs Ag/AgCl) demonstrated that no other ions interfered with the electrochemical response of Cu(I)-biquinoline modified electrodes.

Palabras clave:

Complejo de cobre(I)-biquinolina para la detección selectiva de nitrito en soluciones acuosas Sensor electroquímico de nitrito que utiliza electrodos de carbono vítreo modificados con [Cu(biq)₂]⁺Materiales de sensor a base de cobre respetuosos con el medio ambiente Alta sensibilidad y bajo límite de detección (0,04 μM) para nitrito en experimentos de recuperación de agua

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