Novel catalytic determination of cobalt(II) using oxidation of silver nanoparticles by hydrogen peroxide

Mohammad Ali Karimi, Malihe Al

Abstract

The ability of surface plasmon resonance (SPR) to the catalytic determination of Co(II) was exploited here using oxidation of silver nanoparticles (AgNPs) as a chromogenic reagent with hydrogen peroxide (H2O2). The reaction was followed, spectrophotometrically, by tracing the AgNPs at 405 nm within 5 min after the initiation of reaction. Under the optimal experimental conditions, detection limit and relative standard deviation were 3 ng mL-1 and 4.6% (1.0 µg mL-1; n=7), respectively. The plot of initial reaction rates as a function of Co(II) concentration was linear in the ranges of 6 to 60 ng mL-1 and 0.6 to 350 µg mL-1.