Flow injection determination of hydrogen peroxide using diperiodatoargentate- and diperiodatonickelate-luminol chemiluminescence

Abstract

A novel chemiluminescence (CL) method for the determination of hydrogen peroxide is described. Method is based on the transition metals in highest oxidation state complex, which include diperiodatoargentate (DPA) and diperiodatonickelate (DPN) and show excellent sensitisation on the luminol-H2O2 CL reaction with low luminol concentration in alkaline medium. In particular, the sensitiser which was previously reported (such as Co2+, Cu2+, Ni2+, Mn2+, Fe3+, Cr3+, KIO4, K3Fe(CN)6 etc.) to be unobserved CL due to poor sensitisation with such low concentration of luminol which makes the method hold high selectivity. Based on this observation, the detection limits were 6.5 × 10−9 mol L−1 and 1.1 × 10−8 mol L−1 hydrogen peroxide for the DPN- and DPA-luminol CL systems, respectively. The relative CL intensity was linear with the hydrogen peroxide concentration in the range of 2.0 × 10−8–6.0 × 10−6 mol L−1 and 4.0 × 10−8–4.0 × 10−6 mol L−1 for the DPN- and DPA-luminol CL systems, respectively. The proposed method had good reproducibility with a relative standard deviation of 3.4% (8.0 × 10−7 mol L−1, n = 7) and 1.0% (2.0 × 10−6 mol L−1, n = 7) for the DPN- and DPA-luminol CL systems, respectively. A satisfactory result has been gained for the determination of H2O2 in rainwater and artificial lake water by use of the proposed method.