Testing and Determination Principle of Conductivity in Water

Why do you need to test the conductivity of water? Natural water contains a lot of salt substances, the main components of which are calcium, magnesium, sodium bicarbonate, chloride and sulfate. When its content is too large, it may change the taste when drinking, and may damage the water distribution pipes and equipment; if it is used as boiler water replenishment, it may cause soda and water in the furnace to rise together", corrosion or scaling issues. There are several methods for determining the salinity in water. Using the ion conductivity in water to evaluate the amount of salt content, the analysis method is simple, the operation is fast, and the sensitivity is also high. The index indicating the ability of water to conduct electricity is called conductivity. Therefore, conductivity is a measure of water quality and purity."an indicator of . Since the conductivity is not only related to the ion content in water, but also to the type of ions (valence number, etc.), the salt content of water cannot be calculated based on conductivity alone. In addition, some gases dissolved in water, such as carbon dioxide ( CO2), ammonia (NH3), etc., although they will not form salt content, they will also produce conductive ions. What is the measurement principle of conductivity? Electrolyte solution can conduct electricity, and the size of its conductivity can be expressed by conductance. For the same water sample at the same temperature, the conductance G and resistance R of the water sample are reciprocally related to each other, that is, two metal sheets (ie electrodes) are inserted into the solution, and the resistance between the two electrodes can be obtained by measuring the resistance between the two electrodes. The conductivity of the solution.