A Simple and Sensitive Fluorescence Quenching Method for the Determination of HO Using Rhodamine B and FeO Nanocatalyst.

In pH 1.99 sodium acetate-HCl buffer solutions at 60 °C, Rhodamine B exhibited a strong fluorescence peak at 584 nm using an excitation wavelength of 548 nm. The fluorescence quenching occurred when FeO nanoparticles catalyzed HO oxidation of Rhodamine B. Under the chosen conditions, the fluorescence intensity at 584 nm decreased when the concentration of HO increased. The fluorescence quenching intensity is linear with the concentration of HO in the range of 10-200 nmol/L. Thus, a new and simple and sensitive nanocatalytic fluorescence method was proposed for the determination of HO in synthetic sample, with satisfactory results. [ABSTRACT FROM AUTHOR]