Ultrapure water, also called UP water, refers toresistivityWater up to 18 M Ω * cm (25 ℃).Apart from water molecules, this kind of water has almost no impurities, let aloneBacteria, virus, chlorinedioxinOf course, there are no minerals needed by the human bodytrace elementThat is to say, water with almost all atoms except oxygen and hydrogen.Can be used for ultrapure materials（semiconductorOriginal materials, nano fine ceramic materials, etc.)distillation、Deionization、Reverse osmosis technologyOr other appropriate supercritical fine technology[1]。
Chinese name
Ultra pure water
Foreign name
Ultrapure water
Alias
UP water
Definition
Water with resistivity up to 18M Ω * cm (25 ℃)
Features
There are almost no impurities in the water
Application
Cleaning of utensils, preparation of photolithographic masks, etc
Ultra pure water is the water produced by distillation, deionization, reverse osmosis technology or other appropriate supercritical fine technology to develop ultra pure materials (semiconductor original materials, nano fine ceramic materials, etc.), and its resistivity is greater than 18 M Ω * cm, or close to the limit value of 18.3 M Ω * cm (25 ℃).To put it simply, water is almost free of all atoms except oxygen and hydrogen[2]。Such water is difficult to reach in general process. In theory, secondary reverse osmosis water can be treated by two-stage reverse osmosis followed by a series of mixed exchange resin columns, but the regeneration of exchange resin is inconvenient and the quality is difficult to guarantee.
preparation
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stayAtomic spectrum、High performance liquid chromatographyUltra pure water is required in some experiments such as ultrapure substance analysis and trace substances. The preparation of ultrapure water is as follows[3]：
(1) Add a small amountpotassium permanganateThe water is distilled twice with a glass distillation device, and then distilled with a full quartz distiller, and collected in a quartz container to obtain ultrapure water.
(2) Use strong acid typecationAnd strongly alkalineAnion exchange resinColumnarMixed bedOr series columns.The cation and anion in the water can be fully removed, and the water with a resistivity of 10 Q · cm, commonly known as deionized water, can be distilled with a full quartz still to collect ultrapure water.
application
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Ultra pure water can be used in the following fields[4]：
