The Kinetics of the Interaction Between Iron(III)-Ethylenediaminetetraacetate and Peroxynitrite uri icon

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 22C 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*tb, 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 520 nm for the colored species was determined as 13 M-1cm-1, which is much lower than 520 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. Springer Science+Business Media B.V. 2009.

published proceedings

  • AQUATIC GEOCHEMISTRY

author list (cited authors)

  • Sharma, V. K., Yngard, R. A., Homonnay, Z., Dey, A., & He, C.

citation count

  • 3

complete list of authors

  • Sharma, Virender K||Yngard, Ria A||Homonnay, Zoltan||Dey, Abhishek||He, Chun

publication date

  • June 2010