How to choose a Shanghai laboratory ultrapure water machine

We do experiments every day, and the most exposed reagent is water, which is usually used throughout our experiments. Perhaps because of the ubiquity and availability of water, we often overlook its influence on experimental results. Therefore, the correct choice of a laboratory ultrapure water machine can help researchers avoid many unnecessary troubles. However, there are many brands of ultra-pure water machines in the domestic market, with uneven quality and huge price disparity, which has caused great confusion to buyers who intend to use ultra-pure water machines. They do not know which brand to choose. The following combination My practical work experience will talk about how to choose an ultrapure water machine that suits you. Before talking about how to choose an ultrapure water machine, let’s first understand the difference between pure water and ultrapure water and the current domestic laboratory ultrapure water machine. market conditions. Shanghai laboratory ultrapure water machine

（1) The difference between pure water and ultrapure water

Before choosing a laboratory ultrapure water machine correctly, we must have a good understanding of the following concepts: What is pure water? What is ultrapure water? What is the difference between the two?

Pure water, also known as pure water, refers to water that meets the sanitary standards of drinking water as raw water, and is sealed in In the container, and without any additives, colorless and transparent water that can be directly drunk. The space water and distilled water sold in the market are pure water.

Ultrapure water is based on pure water, which further removes the conductive medium in the water almost completely, and removes the colloidal substances, gases and organic substances that do not dissociate in the water to a very low level. The resistivity is greater than 18MΩ*cm, or close to the limit of 18.25MΩ*cm. Ultrapure water is a level that is difficult to achieve in general processes. Two or more of microfiltration technology, ultrafiltration technology, reverse osmosis technology, EDI technology, and ion exchange technology can be combined through reasonable process design and equipment selection. , can produce ultrapure water, the resistivity can reach 18.20MΩ*cm Shanghai laboratory ultrapure water machine

The difference between pure water and ultrapure water exists in many aspects, only some of them are listed here, which are summarized as follows:

A. The conductivity is different, the conductivity of pure water is between 2-10us/cm, and the conductivity of ultrapure water is 0.056us/cm;

B. The degree of difficulty of manufacture varies. At present, the pure water used in the market is basically obtained by methods such as reverse osmosis and distillation, while ultrapure water is based on pure water and also undergoes photo-oxidation technology and fine treatment. It is prepared by a series of complex purification techniques such as polishing and polishing.

C. The indicators such as heavy metals, bacteria, and particle count are also very different. The impurity content of pure water is ppm level, while that of ultrapure water is ppb level. Simply put, there are no impurities in ultrapure water, which is close to theoretical water.