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Common methods for preparing laboratory water using laboratory ultrapure water

Release time:2021-04-14    Views:1620

       Most of the ultrapure water used in the laboratory has relatively high requirements on water quality, and laboratory ultrapure water is often used for production. According to different applications, it can be divided into three levels of water use: first-level water, the resistance requirement is greater than 10MΩ (conductivity is lower than 0.1us/cm), mainly used for analysis tests with strict requirements, including requirements for particles test. Such as high pressure liquid chromatography analysis of water.

Common methods for preparing laboratory water:

1. Distilled water:

A kind of pure water commonly used in the laboratory, although the equipment is cheap, it is very energy-consuming, water-consuming and slow, and its application will gradually decrease. Distilled water can remove most of the pollutants in tap water, but volatile impurities cannot be removed, such as carbon dioxide, ammonia, silica and some organic compounds. Fresh distilled water is sterile, but bacteria are easy to multiply after storage; in addition, the storage container is also very particular, if it is non-inert material, ions and the shaping material of the container will precipitate and cause secondary pollution.

2. Deionized water:

The use of ion exchange resin to remove anions and cations in water is a traditional process method used for a long time to prepare pure water. After treatment, ultrapure water of a certain purity can be obtained, but there are still soluble organic substances in the water. It can contaminate the ion exchange column and reduce its efficacy, and deionized water can easily cause bacterial reproduction after storage.

3. Reverse osmosis water:

The principle of its generation is that water molecules pass through the reverse osmosis membrane to become pure water under the action of pressure, and the impurities in the water are intercepted and discharged by the reverse osmosis membrane. Reverse osmosis water overcomes many shortcomings of distilled water and deionized water. Reverse osmosis technology can effectively remove impurities such as dissolved salts, colloids, bacteria, viruses, bacterial endotoxins and most organic substances in water.

4. Ultrapure water:

Its standard is that the water resistivity is 18.2MΩ-cm. The process of preparing ultrapure water often adopts reverse osmosis plus ion exchange mixed bed or reverse osmosis plus electrodeionization (EDI) to prepare, and the latter is more economical and environmentally friendly than the former.

The above are the common methods for preparing laboratory water, and the laboratory ultrapure water device is especially suitable for ultrapure water products used in the laboratory. Or use reverse osmosis plus EDI electrodeionization equipment.

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