Ozone is the second to fluorine in oxidation and sterilization power and it reacts with organic and inorganic materials very well. In addition, it leaves no remainders harmful to the environment. Thus, it has been used not only for food containers but also in fish farming, medical and chemical industries etc. Recently, positive attempts are being made to use it to prevent various infectious diseases.
Accurate measurement of ozone concentration is important for its effective use. One of the most cost-effective measurements is using detector paper.
The ozone detector paper for determining concentration of ozone in the atmosphere has already been developed. When indigo carmine reacts with ozone, the paper turns from blue to white. This principle is used to measure albedo for determination of ozone concentration. The measurement range of the paper is 0~400ppb and the CT value is 0~400ppb×h. The unit of time is hour. It is impossible to precisely measure concentration over the range because the detector paper immediately turns into white completely. The response time of the detector paper is over 30 minutes.
However, research into dissolved ozone detector paper has not been conducted.
Kim Yong Ok, a researcher at the Faculty of Applied Chemistry, has developed detector paper for dissolved ozone.
The dissolved ozone reacts with KI to produce iodine, which then reacts with starch to turn the paper blue. This means that the paper turns from white to blue according to the ozone concentration. Thus, the chromaticity of the paper helps determine concentration of dissolved ozone.
This paper guarantees precise and quick measurement for up to 8ppm of concentration of ozone within a short time of 30~40s.
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