It is important to study nonlinear dynamical systems showing pH and temperature oscillations simultaneously. Here, we systematically investigated the bromate-sulfite reaction in its coupled system. Large-amplitude temperature oscillations could be measured accompanied by the pH oscillations with or without permanganate and manganese(II) ions. The modulation effects on the oscillatory dynamics of the bromate-sulfite reaction system produced by permanganate and manganese(II) ions were investigated in detail. On the one hand, with permanganate, an additional negative pH feedback process between permanganate and bisulfite occurs, leading to weakening the pH positive feedback. The above opposite effects make the period length change unmonotonically when adjusting the permanganate concentration and flow rate. On the other hand, with Mn2+ as the feedback agent, the nonmonotonic change of period was not obvious because it only contained one feedback loop, which can only reinforce negative feedback without affecting positive feedback.

中文翻译：

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高锰酸根和锰（II）离子对溴酸盐-亚硫酸盐反应系统中振荡动力学的调节作用。

研究同时显示pH和温度振荡的非线性动力学系统非常重要。在这里，我们系统地研究了其偶联体系中的溴酸盐-亚硫酸盐反应。可以测量伴随着或不伴随着高锰酸盐和锰（II）离子的大幅度温度振荡以及pH振荡。详细研究了调制对高锰酸根和锰（II）离子产生的溴酸亚硫酸盐反应体系振荡动力学的影响。一方面，对于高锰酸盐，高锰酸盐和亚硫酸氢盐之间会发生额外的负pH反馈过程，从而削弱了pH正反馈。当调节高锰酸盐浓度和流速时，上述相反的作用使周期长度单调变化。另一方面，