Determination of the available chlorine concentration in bleach by using cobalt oxide as a catalyst

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1 Citation (Scopus)


The bleach continues to resolve its component over the lapse of time and the potency decreases. If the amount of chlorine was determined before use, bleach was considered to be convenient. Next, the amount of oxygen was generated by resolving sodium hypochlorite and was measured by using cobalt oxide as a catalyst. A proportional relationship was observed between the amount of oxygen V (mmol) and the available chlorine concentration H (%). The linear equation shown by V=6.40H+0.03 was obtained (correlation coefficient of 0.999 and minimum limit of determination of 2.8 × 10.2 mmol). The reliability of measurements was 0.112±0.002% (mean±SD, n=3), 0.018 (coefficient of variation), and 0.001% (standard error). The concentration of the available commercial chlorine was determined by using this equation as a calibration curve. When the bottle was opened, it was determined that 5.2% of the available concentration of chlorine was lost. The reaction mechanism of this experiment to use the cobalt oxide for the catalyst was examined. The results corresponded positively to the measured data and theoretical formula. Finally, it was concluded that this decision to use these amounts of concentrations was effective.

Original languageEnglish
Pages (from-to)16-20
Number of pages5
JournalJournal of the Japan Research Association for Textile End-Uses
Issue number6
Publication statusPublished - Jun 25 2011


  • Bleach
  • Catalyst
  • Cobalt oxide
  • Concentration of available chlorine
  • Reaction rate constant

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • General Business,Management and Accounting


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