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Phys Chem Chem Phys. 2010 Feb 14;12(6):1248-52. doi: 10.1039/b919924a. Epub 2009 Dec 23.

Oscillatory concentration pulses of some divalent metal ions induced by a redox oscillator.

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Department of Analytical Chemistry, L. Eötvös University, H-1518 Budapest 112, P.O. Box 32, Hungary.


Oscillations in the concentration of divalent ions Cd(2+), Ca(2+), Zn(2+), Co(2+) and Ni(2+) are induced by adding these species to the BrO(3)(-)-SO(3)(2-) chemical oscillator in a flow reactor. Producing periodic pulses in the concentrations of these non-redox ions extends our earlier approach to generating forced periodic behavior. Instead of driving pH-dependent equilibrium reactions of the target ion by a pH oscillator backward and forward, we now couple a redox core oscillating reaction to two consecutive reactions taking place between the components of the oscillator and the target element. In the systems examined here, the oscillatory reductant SO(3)(2-) binds the free metal ion in a MSO(3) precipitate, reducing its level to a minimal value when [SO(3)(2-)] is high, followed by release of the metal ion when the sulfite is oxidized by BrO(3)(-).

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