Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (03): 264-267.doi: 10.3866/PKU.WHXB20020315

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Nonlinear Dynamics in KIO4-SC(NH2)2-H2SO4 Reaction System

Wang Shun;Lin Juan-Juan;Huang Zhen-Yan;Gao Qing-Yu;Zhao Min;Lin Zhen-Quan   

  1. Wenzhou Normal College,Wenzhou 325027;China University of Mining and Technology,College of Chemical Engineering,Xuzhou 221008
  • Received:2001-08-06 Revised:2001-10-17 Published:2002-03-15
  • Contact: Wang Shun

Abstract: The reaction between periodate and thiourea has been studied in batch,semibatch reactor and CSTR (continuous stirredtank reactor).A new periodate oscillator has been found.The nonlinear reaction system displays a single peak or oligooscillations concerning the change of pH,Pt potential and iodine absorption in batch.While,oscillations of potential on Pt and Iselective electrodes are observed in CSTR and semibatch .The oscillation behavior is dependent on [KIO4]0/[SC(NH2)2]0 ratio and the initial concentration of acid.A preliminary mechanism based on the valence change of iodine may explain the kinetic phenomena in the present reaction system.

Key words: Oscillation, Oligooscillation, Nonlinear dynamics, Periodate, Thiourea