JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE)

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The influence factors research to the determination of low concentrationchlorine dioxide in water by thymol blue spectrophotometry

SHI Lai-shun,WANG Fang,WANG Lu-yan   

  1. School of Chemistry and Chemical Engineering,Shandong University,Jinan 250061,China
  • Received:2005-09-21 Revised:1900-01-01 Online:2006-06-24 Published:2006-06-24
  • Contact: SHI Lai-shun

Abstract: In recent years, the use of chlorine dioxide as a disinfectant for drinking water has become increasingly attractive. As a result, an accurate method for the determination of mg/L concentration of chlorine dioxide is needed. The low concentration of chlorine dioxide in water was determined by spectrophotometry according to the characteristic of decoloration of thymol blue by using chlorine dioxide as oxidant in this paper. The linearity of the standard working curve is good in the range of 0.00～2.50?mg/L chlorine dioxide concentration in the alkali medium. The interference factors to influence the determination of chlorine dioxide were also investigated. The experiment indicates that the interference is less when ClO2-1.12?mg/L, ClO3-47.04?mg/L, and free available chlorine0.48?mg/L, respectively.

Key words: spectrophotometry, thymol blue, concentration , chlorine dioxide

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