product overview

The DL2018 residual chlorine automatic online analyzer is a product of the 2009 National Major Water Special Project, which combines advanced sequential injection technology with spectrophotometry to detect residual chlorine concentration in water bodies. The instrument can realize real-time, rapid and accurate analysis of residual chlorine content in water quality, and can be used for online rapid monitoring of residual chlorine at pollution source discharge outlets, and online monitoring of residual chlorine in Rivers and Lakes, waterworks and drinking water sources.

Working principle

This instrument uses DPD spectrophotometry to determine residual chlorine. In a buffer solution of disodium hydrogen phosphate potassium dihydrogen phosphate with a pH of 6.5, in the presence of excess KI, elemental chlorine, hypochlorous acid, hypochlorite salt, and chloramine in the water sample are mixed with a developer N, N-diethyl-1,4-phenylenediamine (DPD) solution. The color changes and a red compound is generated. This complex has absorption for specific wavelengths of light. Within a certain concentration range, the absorbance of the system is proportional to the concentration of residual chlorine. The instrument can detect changes in the color of the system, measure changes in its photovoltage, and calculate the absorbance using peak height. Determine the total residual chlorine content in the water sample by utilizing the relationship between absorbance and concentration.

Technical Parameter

★National Major Water Special Project Products