Determination of the Available Chlorine Concentration in Bleach by Using Cobalt Oxide as a Catalyst

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  • 酸化コバルトを触媒に用いた塩素系漂白剤の有効塩素の定量
  • サンカ コバルト オ ショクバイ ニ モチイタ エンソケイ ヒョウハクザイ ノ ユウコウ エンソ ノ テイリョウ

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Abstract

<p>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.</p>

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