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There are many ways to detect the chloride ion content of water. For example, using a water quality analyzer for accurate measurement, perhaps one using three methods: DPD iron titration, DPD colorimetry, and low-level current titration. We all know that products that disinfect water bodies in our lives basically generate chloride ions. The most widely used water system is the drinking water system. Whether it is residential water or public water, in order to ensure the standard of water use, chlorine must be used. Ions clean the water body, and this will cause the occurrence of residual chlorine in the water. We all know that residual chlorine is harmful to the human body, and whether the content of chloride ions in the water body meets the standards set by the world, we can know through some tests.
Daily residents can use some test papers when testing chloride ions in the water, but these test papers can only tell you whether the water contains chloride ions, and some precise data is not known.
Therefore, for occupations with strict requirements such as water plants and swimming pools, water quality analysis instruments must be used for testing. Generally, there are two types of chlorine ion analysis instruments, one is a special water quality analysis instrument for chloride ion, and the other is a commonly used water quality multi-parameter before we told us the difference between too many parameters and single-parameter water quality analyzers, but no matter which analytical instrument is used, DPD is a commonly used test method.
DPD is a chemical indicator that can respond to chloride ions. When it encounters chloride ions in the water, it will dye the water pink to indicate the chlorine content. The detailed data difference can be obtained by reading the color change.
Of course, this change can also be seen by the naked eye, but accurate values not be obtained. The water quality analysis instrument uses an electric eye (also called a photodiode) to measure the change of the light beam through the sample and accurately read the data. For example, if the color of the sample is darker, the amount of light beam passing through the sample will be very small, which indicates that the content of chloride ions is high, and the lighter color allows more light to pass through, which indicates that the content of chloride ions in the water is relatively small. low.
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