高碘酸盐-亚硫酸盐反应体系的复杂动力学  

Complex Kinetics of the Periodate Sulfite System

作　　者：林娟娟[1] 王舜[1] 高庆宇[2] 

机构地区：[1]温州师范学院化学系,温州325027 [2]中国矿业大学化工学院,徐州221008

出　　处：《物理化学学报》2002年第9期817-820,共4页Acta Physico-Chimica Sinica

基　　金：浙江省教育厅自然科学基金(981202);温州市"551"人才工程基金资助项目~~

摘　　要：研究了KIO4-Na2SO3-H2SO4反应体系的复杂动力学,在酸性条件下(pH<3),发现碘电位、Pt电极电位和pH在封闭体系中显示单峰振荡以及半封闭体系和开放体系中的振荡现象.振荡现象受犤Na2SO3犦0/犤KIO4犦0比值以及体系的酸度影响.实验结果表明该体系可能为I2生成和I2消耗所驱动的振荡反应;所拟的反应机理解释了体系所显示的复杂动力学现象.The complex kinetics of the reaction of periodate and sulfite has been investigated. This is a novel periodate-based oscillator. In excess of sulfite and in acidic medium(pH < 3), batch single-peak phenomena and CSTR sustained oscillations of Pt, I- and pH potential, and the complex dynamics in a semibatch are obtained, while the alternative change of color from colorless to brown is also observed. The oscillation behavior is related to [KIO4](o)/ [Na2SO3](o) ratio and acidity. A possible reaction mechanism, which consists of an autocatalytic production of H+ (positive feedback) and a H+-consuming pathway (negative feedback), along with the production and elimination of iodine, could fairly explain the complex dynamical behavior.

关 键 词：化学振荡反应 复杂动力学 高碘酸盐 亚硫酸盐 反应机理 

分 类 号：O643.12[理学—物理化学]