COMBINED KINETIC RESPONSE OF TWO SUBSTRATES WITH SIMILAR REACTIVE PATTERNS

Authors

  • Dana Maria SABOU Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Cluj-Napoca, Romania. Email: dsabou@chem.ubbcluj.ro. https://orcid.org/0000-0001-6199-6081
  • Alexandra Ana CSAVDÁRI Department of Chemical Engineering, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University of Cluj-Napoca, Romania. Email: acsavdari@chem.ubbcluj.ro. https://orcid.org/0000-0003-4321-5610

DOI:

https://doi.org/10.24193/subbchem.2017.1.02

Keywords:

chromium VI oxidation, DL-methionine, S-methylcysteine, combined kinetic response, kinetic modeling

Abstract

The behaviour towards simultaneous oxidation by Cr(VI) in acidic environment of mixtures consisting of two structurally closely related thioethers (S-methylcysteine and DL-methionine) was tested, at 0.085 mol·l-1 H+ and 298 ± 0.1 K. The kinetic and mechanistic patterns of the two substrates when oxidized separately were already known and very similar. Based on that knowledge, the individual kinetic parameters (rate and equilibrium constants) were first computed. Theoretical predictive models for the value of the observed rate constant of a mixture, based on the kinetic data from non-mixtures, are compared with experimental findings and subsequently an empirical calibration surface obtained from all experiments is discussed. Due to differences in the kinetic parameters of the two reactions, in all models the obtained surfaces are asymmetrical, and this opens the possibility to univocally determine the concentrations of both thioethers, without separation.

References

D. Pérez-Bendito, M. Silva, “Kinetic Methods in Analytical Chemistry”, E. Horwood, 1988.

H.A. Motolla, D. Pérez-Bendito, Analytical Chemistry, 1994, 66, 131R.

N. Radić, L. Kukoc-Modun, “Kinetic Methods of Analysis with Potentiometric and Spectrophotometric Detectors – Our Laboratory Experiences”, in Analytical Chemistry, InTech, 2012, chapter 3 and references therein.

H.B. Mark Jr. “Kinetic Methods of Analysis”, in AccessScience, McGraw-Hill Education, 2014.

I. Bâldea, D.-M. Sabou, Studia UBB Chemia, 2001, 46(1-2), 17 and references therein.

D.-M. Sabou, I. Bâldea, Studia UBB Chemia, 2013, 58(4), 81.

D.-M. Sabou, Studia UBB Chemia, 2014, 59(4), 183.

A. Csavdari, I. Bâldea, D.-M. Sabou, Studia UBB Chemia, 2007, 52(3), 113.

I. Bâldea, D.-M. Sabou, A. Csavdari, Studia UBB Chemia, 2007, 52(1), 19.

A. Levina, P.A. Lay, Inorganic Chemistry, 2004, 43, 324.

A. Levina, L. Zhang, P.A. Lay, J. Am. Chem. Soc., 2010, 132, 8720 and references therein.

J.F. Perez-Benito, D. Lamrhari, C. Arias, Canadian Journal of Chemistry, 2011, 72(7), 1637.

R.M.C. Dawson, “Data for Biochemical Research”, Oxford: Clarendon Pres, 1959.

J.T. Edsall, J. Wyman, Biophysical Chemistry, Volume 1, Academic Press, New York, 1958.

N.N. Greenwood, A. Earnshaw, “Chemistry of the Elements”, 2nd Edition, Butterworth-Heinemann, Oxford, 1997, chapter 23.

J.D. Ramsey, L. Xia, M.W. Kendig, R.L. McCreery, Corrosion Science, 2001, 43, 1557.

J.D. Neuss, W. Rieman III, Journal of the American Chemical Society, 1934, 56, 2238.

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Published

2017-03-30

How to Cite

SABOU, D. M. ., & CSAVDÁRI, A. A. . (2017). COMBINED KINETIC RESPONSE OF TWO SUBSTRATES WITH SIMILAR REACTIVE PATTERNS. Studia Universitatis Babeș-Bolyai Chemia, 62(1), 19–33. https://doi.org/10.24193/subbchem.2017.1.02

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