Department of Analytical Chemistry, L. Eötvös University, H-1518 Budapest 112, P.O. Box 32, Hungary.
Phys Chem Chem Phys. 2010 Feb 14;12(6):1248-52. doi: 10.1039/b919924a. Epub 2009 Dec 23.
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)(-).
在流动反应器中向 BrO3(-)-SO3(2-)化学振荡器中添加这些物质，会诱导二价离子 Cd(2+)、Ca(2+)、Zn(2+)、Co(2+)和 Ni(2+)的浓度发生振荡。产生这些非氧化还原离子的周期性脉冲扩展了我们先前生成强制周期性行为的方法。我们不再通过 pH 振荡器来回驱动目标离子的 pH 依赖平衡反应，而是将氧化还原核心振荡反应与振荡器组件和目标元素之间的两个连续反应耦合在一起。在检查的系统中，振荡还原剂 SO3(2-)与游离金属离子结合形成 MSO3 沉淀，当[SO3(2-)]较高时将其浓度降低到最小值，然后当亚硫酸盐被 BrO3(-)氧化时释放金属离子。
