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Measuring principle of turbidity detector

by:BOQU     2023-04-09
Turbidity can reflect the trend of water pollution in water sources and rivers to a certain extent. It is an important water quality parameter index in water quality monitoring work, so it is very important to use a turbidity detector to measure it. This is because turbidity will affect disinfection on the one hand, weaken the bactericidal effect of disinfectants on microorganisms, increase the demand for oxygen and chlorine, and affect the safety of drinking water. On the other hand, it has a significant impact on the microbial indicators of drinking water. It interferes with the determination of bacteria, viruses and surface water, and it also promotes the growth and reproduction of bacteria. The measurement methods based on the turbidity detector are usually divided into scattering turbidimetry, visual turbidimetry and spectrophotometry. The following editor will introduce the measurement principle of the turbidity detector in detail. 1. Scattering nephelometric method The nephelometric method uses a specific light source to irradiate the water sample and a detector at 90 degrees to receive the scattered light. When the water sample contains different degrees of insoluble particles, the scattered light will show different intensity. The turbidity of the water quality can be measured by detecting the scattered light of the water sample with a turbidity detector and converting it into an electrical signal. 2. Visual turbidimetry Visual turbidimetry refers to the method of observing with the eyes and comparing the turbidity of the suspension to determine the content of the suspended matter. Its operation is to compare the water sample with the turbidity standard solution prepared from diatomaceous earth (or kaolin clay). It is stipulated that the turbidity produced by 1mg of diatomite (kaolin) with a certain particle size in 1000ml of water is called 1 degree. The unit of turbidity measured by this method is JTU, and the turbidity detector designed based on this principle is mainly suitable for low turbidity water such as drinking water and source water. 3. Spectrophotometry At a suitable temperature, a certain amount of hexamethylenetetramine is polymerized with hydrazine sulfate to form a white polymer polymer, which is used as a reference turbidity standard solution, and is mixed with water sample turbidity under certain conditions. Degree comparison, it is stipulated that 1L solution contains 0.1mg hydrazine sulfate and 1mg hexamethylenetetramine as 1 degree. During the measurement, the turbidity standard stock solution made of hydrazine sulfate and hexamethylenetetramine is gradually diluted into a series of turbidity standard solutions, and the turbidity value is measured on the turbidity detector, which is mainly suitable for the determination of natural water, drinking water and High turbidity water. Among these three types of methods, the turbidity detector designed by scattering turbidimetry is widely used in the determination of turbidity due to its rapid measurement and easy operation. Assay.
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