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用电位法研究了间苯二酚-KBrO_3-H_2SO_4(体系A)及间苯二酚-KBrO_3-H_2SO_4-MnSO_4(体系B)的化学振荡现象.得出了两振荡体系的诱导期及振荡周期与反应物起始浓度及温度关系的经验方程.间苯二酚在诱导期结束时全被氧化,它不是参与振荡的物质.体系B 在低Mn~(2+)浓度下可呈现双振荡现象,即第一类振荡结束后,经一段非振荡时间再产生第二类振荡.两类振荡的特征不同.第一类振荡与体系A 的振荡行为基本相似.第二类振荡的各个周期随c_M 减小而缩短,最后趋于相同;随c_K、c_H 增大而减小,最后各自趋于一致.但周期与c_R基本无关.第二类振荡出现周期双单调变化现象,它补充与支持了文献[1]中的提法.当Mn~(2+)浓度增高到一定程度后,双振荡现象消失,仅产生一种振荡.体系B 是产生双振荡现象的典型事例之一.
The potential oscillations of resorcinol-KBrO_3-H_2SO_4 (system A) and resorcinol-KBrO_3-H_2SO_4-MnSO_4 (system B) were investigated by potentiometry. The induction and oscillation periods of two oscillating systems Empirical equation of the relationship between reactant initial concentration and temperature: Resorcinol is completely oxidized at the end of the induction period, which is not a substance involved in oscillation. System B can exhibit double oscillations at low Mn 2+ concentrations , That is, after the first type of oscillation, after a period of non-oscillation time and then the second type of oscillation.The two types of oscillations are different.The first type of oscillation and the oscillation behavior of the system A is basically similar to the second type of oscillation cycle with c_M Decrease and shorten, and finally tend to be the same; decrease as c_K and c_H increase, and finally tend to be consistent with each other, but the period is basically irrelevant to c_R. The second type of oscillation appears double monotonous change phenomenon, which complements and supports the literature [1], when the concentration of Mn 2+ increases to some extent, the double oscillation phenomenon disappears and only one kind of oscillation occurs.The system B is one of the typical examples of double oscillation phenomenon.