In some experiments such as atomic spectrum, high performance liquid chromatography, ultra-pure substance analysis, trace substances and so on. Ultra-pure water is needed, which is prepared as follows:
(1) Add a small amount of potassium permanganate water source, conduct secondary distillation with a glass distillation device, then conduct distillation with an all-time distiller, and collect it in a timely container to obtain ultra-pure water.
(2) The mixed bed or series column of strong acid cation and strong base anion exchange resin column is used. Water with resistivity of10Ω cm, which can fully remove cations and anions, is commonly known as deionized water, and then distilled by a full-time distiller to collect ultrapure water.
Introduction:
Ultra-pure water is water produced by developing ultra-pure materials (semiconductor raw materials, nano-fine ceramic materials, etc.) by distillation, deionization, reverse osmosis or other appropriate supercritical fine technologies. ), and its resistivity is greater than 18 mω * cm, or close to the limit value 18.3 mω * cm (25℃). Simply put, water removes almost all atoms 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.