GENESITE Environmental Protection Technology Co., Ltd.
What is the difference between total chlorine and residual chlorine, and what is the detection method?
Nov 04,2024
What is the difference between total chlorine and residual chlorine, and what is the detection method?
Introduction: The residual chlorine in tap water refers to the free residual chlorine）
Residual chlorine standard
In the chlorinated drinking water in the pipe network, the content of free residual chlorine in the water should not be less than 0.3mg/L after 30 minutes of chlorination; the content of free residual chlorine in the water at the end of the pipe network should not be less than 0.05mg/L;
The standard value of free residual chlorine in artificial swimming pool water is 0.3~0.5mg/L;
The content of free residual chlorine on the surface of tableware (drinking utensils) disinfected with chlorine-containing detergents should be less than 0.3mg/L.
Determination of residual chlorine in industrial circulating cooling water: 0.03mg/L~2.50mg/L
Determination method
Residual chlorine refers to the chlorine remaining in the water after water has been in contact with chlorine disinfectants for a certain period of time. There are three forms of residual chlorine:
1. Total residual chlorine: including free residual chlorine and combined residual chlorine.
2. Free residual chlorine: including HOCl and OCl-, etc.
3. Combined residual chlorine: including NH2Cl, NHCl2, NCl3 and other chloramine compounds.
The role of residual chlorine is to ensure continuous sterilization and prevent water from being re-contaminated. However, if the residual chlorine exceeds the standard, it may increase the taste and odor of phenol and other organic matter in the water, and may also generate organic chlorine substitutes such as chloroform that have "three-hazard" effects. Determining the residual chlorine content and existence state in water is very important for doing a good job in drinking water disinfection and ensuring water hygiene. The determination of residual chlorine can be carried out using a portable residual chlorine meter.
Product introduction
GNST-608E multi-parameter water quality online monitor is a new generation of drinking water quality monitoring equipment independently developed and manufactured by our company. Our company masters the core sensor technology of this product, owns the core intellectual property rights of this product, and provides OEM customization services for this product.
The multi-parameter water quality online analyzer is divided into standard version and customized version. The monitoring parameters of the standard version include turbidity, residual chlorine/chlorine dioxide/ozone, pH, temperature, conductivity/TDS, ORP, etc. At the same time, the customized version can delete parameters as needed, customize the instrument appearance, logo, system name and other items.
The multi-parameter water quality online analyzer is an intelligent terminal device for the Internet of Drinking Water Safety. It can be directly connected to the "Smart Suijing Water Quality Cloud Platform" and connected to the "Smart Suijing Water Quality Cloud WeChat Mobile Terminal".
Application Field
The instrument can be widely used in urban or rural water plants, tap water transmission pipelines, tap water secondary water supply, user terminals, indoor swimming pools, large-scale water purification equipment and direct drinking water and other water quality online monitoring. It is an indispensable online analysis equipment in the fields of water plant production process control, water conservancy and water management, and health supervision.
Instrument features
(1) Integration: integrated design, unified water inlet and outlet, centralized data display, wall-mounted installation, prevent flooding and ground moisture, and do not occupy ground space, easy to install and maintain;
(2) Multi-parameter: integrated design, simultaneous monitoring of turbidity, disinfectant (residual chlorine/chlorine dioxide (high purity)/ozone), pH, temperature, conductivity/TDS, ORP and other parameters;
(3) High precision: long-term stable and accurate measurement at the level of tap water (0.1~1NTU) and purified water (0.001~0.1NTU);
(4) High reliability: imported components are used for sensors and instrument components, and a large number of optimizations are made for online water quality analysis, with high reliability;
(5) Easy integration: standard RS485 Modbus-RTU protocol and equipment wireless data transmission channel, cloud platform supports third-party platform data access;
- High customization: the equipment can be customized with trademarks, names, cabinet appearance, etc.
Technical parameters
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