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研究了在非缓冲介质中碘酸盐氧化硫脲的复杂动力学行为,结果发现在封闭条件下体系的pH,[I-]及铂电极电位呈现单峰或准振荡现象.当碘酸盐过量时,体系的pH首先快速上升,然后自催化下降,最后上升趋向平缓,体系碘钟产生的诱导期与体系初始pH成正比;而当硫脲过量时,体系的pH呈现单峰振荡行为并伴随着I2瞬时产生与瞬时消耗的过程,[I2]到达极值的诱导期与体系初始pH呈线性关系.运用包含质子平衡反应、碘钟反应、碘-硫反应以及硫-硫反应的14步反应机理模拟出了封闭体系中pH,[I-]以及[I2]的单峰振荡或准振荡行为.
The complex kinetic behavior of thiourea thiourea in non-buffered media was studied and found that the pH, [I-] and platinum electrode potentials of the system exhibited a single peak or pseudo-oscillatory behavior under confinement conditions. When iodate excess , The pH of the system firstly increased rapidly and then decreased autocatalytically and finally increased slowly. The induction period of iodine clock was directly proportional to the initial pH of the system. When the amount of thiourea was excessive, the pH of the system exhibited unimodal oscillation accompanied with The process of instantaneous production and instantaneous consumption of I2 and the induction period of [I2] reaching the extremum was linear with the initial pH of the system.The 14-step reaction including proton equilibrium reaction, iodine-iodine reaction, iodine-sulfur reaction and sulfur-sulfur reaction Mechanism to simulate the unimodal or quasi-oscillatory behavior of pH, [I-] and [I2] in a closed system.