Abstract
The kinetics of the formation of the purple-colored species between FeIII-EDTA and peroxynitrite were studied as a function of pH (10.4–12.3) at 22°C in aqueous solutions using a stopped-flow technique. A purple-colored species was immediately formed upon mixing, which had an absorbance maximum at 520 nm. The increase in absorbance with time could be fit empirically by a power function with two parameters a and b. The power equation determined was absorbance = a*t b, where a increased linearly with pH and the concentration of peroxynitrite, while b almost remained constant with a value of ~0.25. The molar extinction coefficient ε520 nm for the colored species was determined as 13 M−1cm−1, which is much lower than ε520 nm = 520 M−1 cm−1 for the [FeIII(EDTA)O2]3−, a purple species observed in the FeIII–EDTA–H2O2 system. The results of kinetics and spectral measurements of the present study are briefly discussed and compared with those of the reaction between Fe(III)-EDTA and hydrogen peroxide.
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Acknowledgment
We wish to thank Dr. Mary Sohn for useful comments on the paper. We also thank reviewers for their useful comments to improve the paper.
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Sharma, V.K., Yngard, R.A., Homonnay, Z. et al. The Kinetics of the Interaction Between Iron(III)-Ethylenediaminetetraacetate and Peroxynitrite. Aquat Geochem 16, 483–490 (2010). https://doi.org/10.1007/s10498-009-9083-2
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DOI: https://doi.org/10.1007/s10498-009-9083-2