Autor(es)

Oliveira, Ana C. M. ; Bernalte, Elena ; Melo, Larissa M. A. ; Augusto, Karen K. L. ; dos Santos, Wallans T. P. ; Fatibello-Filho, Orlando ; Munoz, Rodrigo A. A. ; Crapnell, Robert D. ; Banks, Craig E.

• Tipo de documento: Artigo Científico
• Fonte: Microchemical Journal; v. 218, p. 9-pg., 2025-11-01.

Resumo

Nitrite (NO2-) is a potential contaminant in water samples, capable of causing adverse effects on human health. Therefore, it is essential to develop effective, rapid, and portable methods for in situ monitoring. In this context, colorimetric methods and electrochemical sensors stand out for their low cost, operational simplicity, and ability to achieve accurate results in environmental sample analyses. To further enhance user confidence, this study presents a combined approach for nitrite determination in water samples, integrating colorimetric detection using bromocresol green as a reagent with electrochemical analysis via screen-printed carbon electrodes. The proposed method demonstrated linear ranges between 12 and 400 mu mol L-1 before the colorimetric reaction and 50-400 mu mol L-1 afterwards, with excellent limits of detection of 0.36 mu mol L-1 and 38 mu mol L-1 for each step, respectively. Excellent selectivity with both methods was achieved, even in the presence of potential interferences, along with recoveries close to 100 % in real water samples. Furthermore, this approach aligns with green chemistry principles by minimising waste and avoiding complex electrode modifications. This combined strategy demonstrates efficient, validated analytical performance, making it a reliable and practical solution for monitoring nitrite levels in environmental water samples. (AU)

• Processo FAPESP: 24/04116-8 - Emprego de solventes eutéticos profundos em procedimentos espectrofotométricos e eletroanalíticos sustentáveis
• Beneficiário: Orlando Fatibello Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular