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Issue 9, 2011
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Flow-injection analysis of hydrogen peroxide based on carbon nanospheres catalyzed hydrogen carbonate–hydrogen peroxide chemiluminescent reaction

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Abstract

A flow-injection chemiluminescence (CL) system with high sensitivity, selectivity, rapidity, and reproducibility is proposed for the determination of hydrogen peroxide (H2O2) in water samples. The system is based on the reaction of hydrogen peroxide and hydrogen carbonate solution. Carbon nanospheres (CNSs) prepared from aqueous glucose solution are used to enhance the weak CL. The CL intensity was found to be directly proportional to the concentration of H2O2 present in the sample solutions. The effects upon the CL of several physicochemical parameters, including the concentration of the reagents, the mixing order of the reagents, flow rate, pH, particle size of CNSs and other relevant variables, were studied and optimized. The proposed method exhibited advantages in a larger linear range of 5.0 × 10−8 to 3.0 × 10−6 mol L−1 and a lower limit of detection of 1.0 × 10−9 mol L−1 (S/N = 3). This method has been successfully applied to the evaluation of H2O2 in tap water and snow water with recoveries from 80 to 110%. The relative standard deviation (RSD) was less than 8% for intra- and inter-assay precision. Based on the kinetic curve, the CL spectrum, fluorescence spectrum, UV-visible spectrum, and electron spin resonance (ESR) spectrum of NaHCO3–H2O2–CNSs system, a possible CL mechanism was proposed. Superoxide ion radical (˙O2) and hydroxide radical (˙OH) were generated during the reaction of NaHCO3 and H2O2. They were the key intermediates for the production of hole-injected and electron-injected CNSs in the CL process.

Graphical abstract: Flow-injection analysis of hydrogen peroxide based on carbon nanospheres catalyzed hydrogen carbonate–hydrogen peroxide chemiluminescent reaction

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Article information


Submitted
23 Oct 2010
Accepted
20 Feb 2011
First published
07 Mar 2011

Analyst, 2011,136, 1957-1964
Article type
Paper

Flow-injection analysis of hydrogen peroxide based on carbon nanospheres catalyzed hydrogen carbonate–hydrogen peroxide chemiluminescent reaction

H. Chen, L. Lin, Z. Lin, C. Lu, G. Guo and J. Lin, Analyst, 2011, 136, 1957
DOI: 10.1039/C0AN00815J

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