Precautions for the determination of residual chlorine

Chlorine is very unstable in aqueous solution, especially when the concentration is low, the content will decrease rapidly. Exposure to sunlight and other intense light or agitation accelerates the rate of chlorine reduction. Therefore, it cannot be stored after sampling, and the determination of chlorine must be started immediately, while avoiding light exposure and stirring the water sample. All operations in the determination process should avoid direct sunlight, preferably at the lowest possible temperature and soft light, and all colorimetric methods need to use color and turbidity blanks to compensate for the color and color of the raw water. The blank value must be determined especially when the turbidity and color are high. When using the o-toluidine visual colorimetric method to measure residual chlorine, if the water sample is mixed with the standard o-toluidine solution and immediately colorimetrically measured, the measured result is free residual chlorine. After the chromaticity, the colorimetry is carried out, and the result obtained is the total residual chlorine. The total residual chlorine minus the free residual chlorine is the combined residual chlorine. When using the o-toluidine visual colorimetry method, if the amount of residual chlorine is large, it will produce orange yellow; if the water sample is too high in alkalinity and the amount of residual chlorine is small, it will produce light green or light blue. At this time, an additional 1mL o-toluidine standard solution can be added to produce a normal light yellow color. The role of residual chlorine is to ensure continuous sterilization and prevent water from being re-polluted. However, if the amount of residual chlorine exceeds the standard, it may aggravate the taste and odor produced by phenol and other organic substances in the water, and may also generate harmful substances such as chloroform."San Zhi"Functional organochlorides. Determining the content and state of residual chlorine in water is extremely important for doing a good job in drinking water disinfection and ensuring the safety of water hygiene.

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