At present, laboratories of universities, research institutes, and other related organizations basically use ultra-pure water machines instead of distilled water. The laboratory ultrapure water machine is more convenient and affordable than buying water or using an electric water distiller. This point has been recognized by the majority of experimental personnel, but the instrument is, after all, the laboratory's basic equipment. Although many technicians use ultra-pure water machines , their understanding of ultra-pure water machines is not much, often There are misunderstandings on the purchase. So, how to choose the ultra-pure water machine that is suitable for oneself, general reference purchases from the following three points, take a look together.
First, water quality
The national laboratory standard water has three types of water: first-grade water, second-grade water, and third-grade water. However, most laboratories use two types of water: first, third-grade water, such as distilled water, for glassware cleaning; It is a type of water and is mainly used for chemical analysis or analysis of precision instruments such as liquid phase and atomic absorption. Customers should choose the grade of ultrapure water machine according to actual water quality requirements. Ultrapure water machines using tap water as the source of water have two (two) water outlets, one is pure water, that is, third grade water; the other is one grade water, ie ultrapure water (strictly speaking, one grade of water The resistance is greater than 10 megohms, while the ultrapure water has a resistance greater than 18 megohms).
Based on experience, you can follow the following purchasing principles, which can be corresponding.
1, the experimental content is divided into inorganic experiments and organic experiments, inorganic experiments only need resistance greater than 18 megohms of water on the line, and organic experiments are usually to remove organic substances in water, so in addition to the resistance greater than 18 megohm, but also the total organic carbon index of. If it is a biological experiment, we must remove the bacteria in the water.
2. Types of instruments Customers can choose ultrapure water machines according to the type of instruments used. The resistance of liquid water for use in liquid phase is greater than 18 megohms; and organic matter should be removed; atomic absorption, atomic fluorescence, and environmental monitoring instruments should use water greater than 18 megohms; and water for life sciences such as PCR must be sterilized in addition to resistance greater than 18 megohms. In addition to organic matter, in addition to heat sources.
3. Current water source If the customer's current water use is qualified, the source of the pure water can also be informed of the ultrapure water machine manufacturer. The technical personnel will recommend the corresponding model according to the situation. The above three principles are based on actual application experience and can be referenced, but the most accurate model selection is still to provide detailed water quality parameters such as resistance, trace elements, bacteria, and total organic carbon levels.
Second, the amount of water
At present, the ultrapure water machine on the market generally produces 5-20 liters/hour of water, and more than 20 liters is a non-standard model. The customer should select the specifications of the ultrapure water machine according to the actual water consumption, generally following the principle of 2 times the relationship. If the water consumption is 20 liters/day, then a machine with a specification of 10 liters/hour is used. If the selected size is too small, the consumption of the ultrapure water machine will be very fast, and the selection of the specification will be too wasteful. If there is a large amount of concentrated water, you need to buy a larger pure water bucket, otherwise the water can not keep up.
Third, raw water quality
When purchasing the ultrapure water machine, the customer must provide the manufacturer with the quality of the raw water, such as many sediments, high hardness, and groundwater. The process of the ultrapure water machine is determined according to the quality of the raw water. To add more pretreatment equipment, high hardness, to add softening device, high salt content, secondary reverse osmosis process and so on. If an ultrapure water machine using pure water as the source of water is used, it is only necessary to provide water quality requirements and water consumption.
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