How does the laboratory pure water system grade all kinds of pure water?

        Because of its low operating cost and centralized management, laboratory pure water systems can provide consistent secondary pure water, which can be used not only for laboratory instruments, but also for the preparation of buffers and media required for non-critical applications. Equipped with an EDI module, the system features unique bag tank technology and innovative iJust functionality that minimizes cost and time and ensures that resources are fully utilized.

The decentralized pure water supply mode of the laboratory pure water system refers to the installation of pure water machines or finished water at each water point in the laboratory.

Classification of various pure water by laboratory pure water system:

1. Distilled water: a kind of pure water commonly used in the laboratory, although the equipment is cheap, it is very energy-consuming and 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: Ion exchange resin is used to remove anions and cations in water, but there are still soluble organic substances in the water, which can contaminate the ion exchange column and reduce its efficacy. Deionized water is also easy to 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 retained 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. However, reverse osmosis membranes produced by different manufacturers It has a great influence on the quality of reverse osmosis water. The pore size of the reverse osmosis membrane is generally between 10A and 100A, so it can remove more than 95% of ionic impurities.

4. Ultrapure water: its standard is that the water resistivity is 18.2MΩ-cm. However, ultrapure water is not the same in terms of TOC, bacteria, endotoxin and other indicators, which should be determined according to the requirements of the experiment. For example, cell culture requires bacteria and endotoxin, while HPLC requires low TOC.