02 Jul 2024
Analysis of commonly used professional names in chemical water treatment
Analysis of commonly used professional names in chemical water treatment
16. Turbidity; also known as turbidity. From a technical point of view, turbidity is a water quality substitute parameter used to reflect the content of suspended matter in water. The main suspended matter in water is generally soil. The unit of standard turbidity is 1mg of silica in 1L of distilled water, expressed as 1PPm.
17. Total dissolved solids; TDS, also known as the total amount of dissolved solids, is measured in milligrams per liter (mg/L), which indicates how many milligrams of dissolved solids are dissolved in 1 liter of water.
18. Resistance; According to Ohm's law, under constant water temperature, the resistance value R of water is inversely proportional to the vertical cross-sectional area F of the electrode and directly proportional to the distance L between the electrodes.
19. Conductivity; The degree of water's electrical conductivity is called conductivity S (or conductivity).
20. Conductivity; The conductivity of water is the reciprocal of the resistance of water, and it is usually used to indicate the purity of water.
21. Resistivity: The resistivity of water refers to the resistance between the two opposite sides of a cube of water with a side length of 1CM at a certain temperature. Its unit is ohm*cm (Ω*CM), which is generally a parameter indicating the quality of high-purity water.
22. Softened water: refers to water in which the hardness (mainly calcium and magnesium ions in water) is removed or reduced to a certain extent. During the softening process, only the hardness of water is reduced, while the total salt content remains unchanged.
23. Desalted water: refers to water in which salts (mainly strong electrolytes dissolved in water) are removed or reduced to a certain extent. Its conductivity is generally 1.0-10.0μs/cm, resistivity (25℃) 0.1--1000000Ω.cm, and salt content is 1.5mg/L.
24. Pure water: refers to water in which strong electrolytes and weak electrolytes (such as SiO2, C02, etc.) are removed or reduced to a certain extent. Its conductivity is generally 1.0-0.1μs/cm, resistivity 1.0--1000000Ω.cm. Salt content <1mg/l.
25. Ultrapure water; refers to water in which the conductive medium is almost completely removed, and the non-dissociated gas, colloid and organic matter (including bacteria, etc.) are also removed to a very low level. Its conductivity is generally O.1-0.055μs/cm, resistivity (25℃)>10×1000000Ω.cm, and salt content <0.1mg/l. Ideal pure water (theoretically) has a conductivity of 0.05μs/cm and a resistivity (25℃) of 18.3×1000000μs/cm.
26. Deoxygenated water; also known as deoxygenated water, removes dissolved oxygen from water and is generally used for boiler water.
27. Ion exchange: a method of separation using the difference in ion exchange capacity between the exchangeable groups in the ion exchanger and the various ions in the solution.
28. Cationic resin: has acidic groups. In aqueous solution, the acidic groups can ionize to generate H+, which can exchange ions with cations in water.
29. Anionic resin: contains alkaline groups. They ionize in aqueous solution and exchange ions with anions.
30. Inert resin: has no active groups and no ion exchange effect. The relative density is generally controlled between anionic and cationic resins to separate anionic and cationic resins, avoid cross contamination of anionic and cationic resins during regeneration, and make regeneration more complete.