Ultra-pure water, also known as UP water, refers to water with resistivity of 18mω * cm (25℃). This kind of water contains almost no impurities except water molecules, and there are no organic substances such as bacteria, viruses and chlorine-containing dioxins. It can be used in the preparation process of ultra-pure materials (semiconductor raw materials, nano-fine ceramic materials, etc.). ) by distillation, deionization, reverse osmosis or other suitable supercritical fine technology.
Ultra-pure water is water produced by distillation, deionization, reverse osmosis or other appropriate supercritical fine technology in order to develop ultra-pure materials (semiconductor raw materials, nano-fine ceramic materials, etc.). ), in a nutshell, is to remove almost all atoms of water except oxygen and hydrogen. This kind of water is difficult to achieve by general technology. Theoretically, two-stage reverse osmosis can be treated by two-stage reverse osmosis and then by a series of mixed exchange resin columns, but the regeneration of exchange resin is inconvenient and the quality is difficult to guarantee.
Preparation of ultrapure water
In some experiments such as atomic spectrum, high performance liquid chromatography, ultra-pure substances and trace substances analysis. It is necessary to use ultra-pure water to prepare ultra-pure water, add a small amount of potassium permanganate water source, conduct secondary distillation with a glass distillation device, then conduct distillation with a full-time distiller, and collect it in a timely container to obtain ultra-pure water.
A mixed bed or series of columns using strong acid cation and strong base anion exchange resin columns. Water with resistivity of 10 QCM, which can fully remove cations and anions, is commonly known as deionized water, and then distilled by a full-time distiller to collect ultra-pure water.
The above contents refer to Baidu Encyclopedia-Ultra-pure water.