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Limitation of ferrozine method for Fe(II) detection: reduction kinetics of micromolar concentration of Fe(III) by ferrozine in the dark

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The dark reduction kinetics of micromolar concentrations of Fe(III) in aqueous solution were studied in the presence of millimolar concentrations of ferrozine (FZ) over the pH range 4.0–7.0. A pseudo-first-order kinetics model was used to describe Fe(III) reduction at pH 4.0 and 5.0, and the reduction rate decreased with increasing pH or initial Fe(III) concentration. A more molecular-based kinetics model was developed to describe Fe(III) reduction at pH 6.0 and 7.0. From this model, the intrinsic rate constants (k 1) of Fe(III) reduction by FZ in the dark were obtained as 0.133 ± 0.004 M−1 s−1 at pH 6.0 and 0.101 ± 0.009 M−1 s−1 at pH 7.0. It was also found in this model that a higher pH, a higher concentration of Fe(III), a lower concentration of FZ and less incubation time led to a lower fraction of Fe(III) reduction by FZ in the dark.
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Keywords: Fe(III); Ferrizone; dark; kinetic model; reduction

Document Type: Research Article

Affiliations: 1: National Engineering Laboratory of Coal-fired Pollutants Emission Reduction, School of Energy and Power Engineering, Shandong University, Jinan, PR China 2: School of Environmental Science and Engineering, Shandong University, Jinan, PR China

Publication date: December 8, 2015

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