An electrochemical nanosensor for simultaneous determination of hydroxylamine and nitrite using oxadiazole self-assembled on silver nanoparticle-modified glassy carbon electrode

Abstract

Environmental pollutions are causing serious health problems for human, and their quantification is still a big challenge. For determination of hydroxylamine and nitrite as two important environmental pollutants, a novel and highly sensitive electrochemical nanosensor has been developed for the simultaneous determination of hydroxylamine and nitrite in the presence of nine interference moieties using oxadiazole self-assembled on silver nanoparticle-modified glassy carbon electrode (OAgNPs-GCE). The charge transfer coefficient, α, and the charge transfer rate constant, k s, of oxadiazole adsorbed on AgNPs were calculated. The OAgNPs-GCE displayed excellent electrochemical catalytic activities toward the oxidation of hydroxylamine. The detection limit of 0.10 μM and two linear calibration ranges of 0.45–69.4 and 69.4–833.3 μM are obtained for hydroxylamine determination at OAgNPs-GCE surface using a differential pulse voltammetric method. The investigated method showed good stability, reproducibility, and repeatability and high recovery in real samples. Moreover, this modified electrode is found quite effective in simultaneous determination of hydroxylamine and nitrite in the presence of nine moieties. OAgNPs-GCE has been applied to the determination of hydroxylamine and nitrite at water samples with acceptable results.