Water obtained by re distillation of distilled water
Double distilled water is a kind of re distilled water, which will pass oncedistillationAfter the water is distilled again, the water is obtained.English: double discharged water, short for ddwater
Chinese name
Double distilled water
Foreign name
double distilled water
Production process
Water obtained by re distillation after one distillation
distilled water: water produced by distillation and condensation, soinorganic saltIt will contain very little.If the water is obtained through only one distillation, although the non-volatileComponents（salt）Components (ammoniacarbon dioxide、organic compound）It will still enter into distilled water.
Ultra pure water:Ultra pure water, also known as high-purity water, refers toConductive mediumAlmost all of them are removed, and the water is notdissociationThe colloidal substances, gases and organic substances in the water are removed to a very low degree.The salt content of ultrapure water is below 0.1mg/L,conductivityLess than 0.1 μ s/cm.Common purification instrument: NANOPure or Milli-Q
Deionized water:applicationion exchange resinRemoval ofanionandcation, but there are still soluble organic matters in the water, which can be pollutedIon exchange columnAs a result, the efficacy of deionized water is reduced, and the bacteria are easy to multiply after being stored.The process from tap water to deionized water usually involves several stepsQuartz sandFilter impurities with coarse particles, remove ions through anion and cation exchange columns respectively, and then pressurize them to passReverse osmosis membraneAt last, it is generally necessary to go through a step of ultraviolet sterilization to remove microorganisms in the water. IfresistivityIf the requirements have not been met, another ion exchange and reverse osmosis process can be carried outanddistilled waterIt is only gasification before condensation, and the purity is generally inferior to deionized water. In fact, deionized water is mostly used in the semiconductor industry
Sterile water:Usually by high-temperature steam method, UHT thermal method,Chemical method, Ozone methods and physicsFiltration methodGenerally speaking, the inorganic salts in the water obtained by killing or filtering the microorganisms in the water will not decrease
