| 摘要 |
PROBLEM TO BE SOLVED: To obtain a detector high in sensitivity and simple by a method wherein a solid coloring agent which is composed of phenolphthalin, of a compound which generates copper ions when dissolved in water and of an alkaline compound is sealed in a translucent container from which oxygen and carbon dioxide are removed. SOLUTION: As phenophthalin, its salt with an alkaline compound is used in an amount which amounts to about 3 to 30μmol/l when a sample is dissolved. As a compound which generates copper ions when dissolved in water, copper sulfate, copper chloride, copper formate or the like is used in an amount which amounts to about 0.03 to 2.8μmol/l of copper ions when the sample is dissolved. As an alkaline compound, lithium hydroxide, sodium hydroxide, potassium hydroxide or the like is used in an amount which amounts to a pH of about 10 to 13 when the sample is dissolved. A coloring agent which is composed of them is sealed into the inside of a glass pipe 1 in the order of glass wool 2, a filtering material 3, glass wool 4 and the coloring agent 5, and a detector is formed. The sample is sucked into the detector so as to come into contact with the coloring agent. Then, when hydrogen peroxide is contained in the sample, it is colored to be a reddish purple color, and it is compared with a color reference so as to be determined quantitatively.
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