The kinetics of the interaction between Iron(III)-Ethylenediaminetetraacetate and peroxynitrite

Virender K. Sharma, Ria A. Yngard, Z. Homonnay, Abhishek Dey, Chun He

Research output: Contribution to journalArticle

3 Citations (Scopus)

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*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 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.

Original languageEnglish
Pages (from-to)483-490
Number of pages8
JournalAquatic Geochemistry
Volume16
Issue number3
DOIs
Publication statusPublished - Jun 2010

Fingerprint

Peroxynitrous Acid
ethylenediaminetetraacetic acids
EDTA
Edetic Acid
Iron
absorbance
iron
kinetics
Kinetics
interactions
extinction coefficient
peroxides
hydrogen peroxide
Hydrogen Peroxide
extinction
aqueous solution
aqueous solutions
coefficients

Keywords

  • EDTA
  • Iron(III)
  • Kinetics
  • Peroxynitrite
  • Time-resolved spectra

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

The kinetics of the interaction between Iron(III)-Ethylenediaminetetraacetate and peroxynitrite. / Sharma, Virender K.; Yngard, Ria A.; Homonnay, Z.; Dey, Abhishek; He, Chun.

In: Aquatic Geochemistry, Vol. 16, No. 3, 06.2010, p. 483-490.

Research output: Contribution to journalArticle

Sharma, Virender K. ; Yngard, Ria A. ; Homonnay, Z. ; Dey, Abhishek ; He, Chun. / The kinetics of the interaction between Iron(III)-Ethylenediaminetetraacetate and peroxynitrite. In: Aquatic Geochemistry. 2010 ; Vol. 16, No. 3. pp. 483-490.
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