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The kinetics of the complex formation between iron(III)-ethylenediaminetetraacetate and hydrogen peroxide in aqueous solution |
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| Authors: | Virender K. Sharma Frank J. Millero |
| Affiliation: | a Chemistry Department, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901, USA b Rostenstiel School of Marine Sciences, Marine and Atmospheric Chemistry, 4600 Rickenbacker Causeway, Miami, FL 33149, USA c Department of Nuclear Chemistry, Eotvos Lorand University, 1518 Budapest, Hungary |
| Abstract: | The kinetics of the formation of the purple complex [FeIII(EDTA)O2]3−, between FeIII-EDTA and hydrogen peroxide was studied as a function of pH (8.22-11.44) and temperature (10-40 °C) in aqueous solutions using a stopped-flow method. The reaction was first-order with respect to both reactants. The observed second-order rate constants decrease with an increase in pH and appear to be related to deprotonation of FeIII-EDTA ([Fe(EDTA)H2O]− ⇔ Fe(EDTA)OH]2− + H+). The rate law for the formation of the complex was found to be d[FeIIIEDTAO2]3−/dt=[(k4[H+]/([H+] + K1)][FeIII-EDTA][H2O2], where k4=8.15±0.05×104 M−1 s−1 and pK1=7.3. The steps involved in the formation of [Fe(EDTA)O2]3− are briefly discussed. |
| Keywords: | Iron(III) Hydrogen peroxide Kinetics Peroxo complex EDTA |
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