JOURNAL ARTICLE
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Rapid quantitative determination of hydrogen peroxide by oxidation decolorization of methyl orange using a Fenton reaction system.

Analytica Chimica Acta 2008 November 24
In this study, a sensitive and rapid method for hydrogen peroxide (H(2)O(2)) determination has been developed with the aid of oxidation decolorization of methyl orange (MO) by using Fenton reactions, because the decolorization extent of MO solution (at the maximum absorption wavelength of 507 nm) is proportion to the concentration of H(2)O(2). Under optimum conditions, this spectrophotometric method for the H(2)O(2) analysis yields a dynamic range of H(2)O(2) concentration from 5.0 x 10(-7) to 1.0 x 10(-4) mol L(-1) (r=0.997) and a detection limit (3 sigma/k) of 2.0 x 10(-7) mol L(-1). This method for the determination of H(2)O(2) (0.04 mmol L(-1)) is able to tolerate the interference from NaCl (0-5.0 mmol L(-1)), Na(2)SO(4) (0-5.0 mmol L(-1)), MgCl(2) (0-5.0 mmol L(-1)), sodium humate (0-0.1 mmol L(-1)), benzene (0-0.2 mmol L(-1)), toluene (0-0.2 mmol L(-1)), chlorobenzene (0-0.2 mmol L(-1)) and chloroform (0-0.2 mmol L(-1)). The analysis results for practical rainwater samples are in good agreement with the classical N,N-diethyl-p-phenylenediamine (DPD) method for H(2)O(2) determination.

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