Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (07): 772-775.doi: 10.3866/PKU.WHXB20040722

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Dependence of the H2O2-Na2S2O3 Reaction on pH and [H2O2]0/[Na2S2O3]0

Xue Ke-Yi;Gao Qing-Yu;Liu Bing;Xu Liang-Qin   

  1. College of Chemical Technology, China University of Mining and Technology, Xuzhou 221008
  • Received:2003-11-28 Revised:2004-03-17 Published:2004-07-15
  • Contact: Gao Qing-Yu; E-mail:gaoqy@cumt.eud.cn

Abstract: In the H2O2-Na2S2O3 reaction system both the pH value and [H2O2]0/[Na2S2O3]0 are important factors for stability of different intermediates. In this paper, the influences of the two factors on the composition and stability of the products were investigated. The results show that sulfur(0) is the main productat pH< 3, while tetrathionate is stable only in the pH range between 3 and 6. The concentration of sulfate will increase when pH and [H2O2]0/[Na2S2O3]0 are getting high. In neutral and week base solutions, the concentration of S(IV) species shows a peak value.

Key words: Thiosulfate, Nonlinear reaction mechanism, Simulation