Mechanism of the oscillating chemiluminescence reaction in the luminol-H2O2-KSCN-CuSO4-NaOH system

Erika Toki, Shiori Osaki, Misato Nakamura, Kazuki Tsuoka, Nobutoshi Samejima, Tetsuto Nakashima, Rin Abe, Takahiro Oyama, Koichi Tsukiyama

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3 Citations (Scopus)

Abstract

We conducted a simultaneous measurement of the potential of Cu2+, oxidation-reduction potential (ORP), and the chemiluminescence intensity in the luminol-H2O2-KSCN-CuSO4-NaOH system. Two types of chemiluminescence were identified: a very faint continuous chemiluminescence and a strong oscillating chemiluminescence. The correlation between the potential of Cu2+ and ORP was measured experimentally for the first time. The effect of the initial concentrations of Cu2+ and H2O2 on the overall chemiluminescence intensity and the oscillation frequency was investigated in detail. Time-dependent concentration variation of the chemical species existing in the reaction system was calculated using a Runge-Kutta method. Two elementary chemical reactions not considered previously were taken into consideration. The overall experimental behavior was well explainable with our simulation. Based upon the comparison of our simulation with the experiment, we proposed that the strong oscillating chemiluminescence was induced by the reaction of luminol with ·OS(O)CN.

Original languageEnglish
Pages (from-to)907-917
Number of pages11
JournalInternational Journal of Chemical Kinetics
Volume52
Issue number12
DOIs
Publication statusPublished - 1 Dec 2020

Keywords

  • Runge-Kutta method
  • chemiluminescence
  • luminol
  • reaction mechanisms

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