摘要
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 oscillations of m-C_6H_4(OH)_2-KBrO_3-H_2SO_4(system A) as well as m-C_6H_4(OH)_2-KBrO_3-H_2SO_4-MnSO_4(system B)have been studied.The relations betweeninduction period as well as oscillating period and the initial concentrations of reactantsas well as temperatures of the system have been determined experimentally.With low concentrations of Mn^(2+),system B exhibits two types of oscillationphenomena,ie,after the first type of oscillation and through a certain time interval,a second type of oscillation occurs.The characteristics of the two types of oscillationare different.The oscillating behavior of the first type of oscillation is similar tothat of system A.The second type of oscillation may exhibit period-double-monotonousphenomena,which supports the idea in reference[1].With higher concentrations ofMn^(2+),the second type of oscillation disappears and the system exhibit only oneoscillation.System B is one of the typical examples showing the two types ofoscillations.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1993年第2期218-223,共6页
Acta Physico-Chimica Sinica
关键词
化学振荡
诱导期
振荡周期
Chemical oscillation
Induction period
Oscillating period
Period-double-monotonous phenomena
Bi-oscillation
