A chemical mechanism including 22 reactions and 15 species is suggested for describing
the dynamical behavior of the ferroin controlled BrO3- 1,4-cyclohexanedione (CHD)
batch oscillator. The model represents an extended version of the mechanism developed
to explain the oscillations in the ferroin-free BrO3--CHD system. The kinetics and
rate constants for some additional reactions such as ones between ferriin and CHD,
BrCHD (2-bromo-1,4-cyclohexanedione) and H(2)Q (1,4-hydroquinone) and between ferroin
and bromate were determined and incorporated in the mechanism of the BrO3--CHD reaction.
The model proposed here simulates satisfactorily the behavior of the BrO3--CHD ferroin
oscillator at increasing concentration of ferroin and at the condition of [ferroin]
= 0 mol dm(-3).