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Everyone knows the process of processing tap water in the waterworks. In fact, the processing of ultrapure water and the processing concept of tap water are similar. It is just that the ingredients in the water have higher and stricter requirements. Now many domestic manufacturers are producing ultrapure water. Machine, but the methods are similar, the basic process is almost no difference, the general difference is the filter effect of the filter, the choice of RO membrane, the current domestic machine for PP cotton, RO membrane, ultra-purification column selection Generally, it is chosen to use the imported, because the domestic technology can not be achieved, in fact, the competition is the quality of the machine and the replacement of consumables. These are just too many introductions. Let's talk about the principle of water production in ultra-pure water machines.
First of all, many of us use tap water to convert into pure water, which is GB/6682-92 standard grade I water, grade II water, grade III water, and GB/T11446.1-1997 electronic grade ultrapure water. The tap water first enters the PP cotton for preliminary filtration, first filtering out some fine solids and rust in the water. However, there are still many anions and cations in the water from the initial filtration. These ions are not removable by PP cotton, then we will Activated carbon is used to adsorb some of the heavy metal ions and cl ions inside, so that there are few impurities in the water, but the water can not meet the requirements of the general laboratory, and then we can use another RO membrane to do it again. Filtration, the density of the RO membrane is very high, and almost all impurities with a molecular weight of more than 100 can be removed. The salt removal rate is about 95% to 99%, and the particles in the remaining water have almost no effect. Such water is used for cleaning. The vessels in our laboratory are completely ok. This water is equivalent to the previous distilled water, which is often referred to as Class III water. Of course, this water is still satisfied for the higher requirements of laboratory equipment. No, then we need something else to make the water more pure. We usually use deionized resin and ultra-purified resin to remove trace impurities and salt from the water, so that the water can reach Grade II water and Grade I water. The standard, for some experiments with special requirements such as HPLC, IC, GC, ICP-MS, PCR, TOC analysis, etc. must add UV UV lamp sterilization and inhibition of organic matter, for some genetic research, cell culture, electrophoresis For the preparation of gel analysis medium, UF ultrafiltration is needed to remove the heat source. Some also need to use UV and UF to meet the requirements of the experimental water quality. The specific method is generally based on what the customer is doing, the water use method and The budget can only be selected for the customer, these are the words.
In general, the principle of ultra-pure water machine is the same, no matter the difference between the principle of Millipore and domestically produced machines, the difference is only the domestic and imported technical content, as well as the fineness of workmanship, as long as domestic The development of the machine to strengthen the technology is actually not worse than the imported machine.
The difference between ultra-pure water machine and distilled water machine and working principle
Nowadays more and more laboratories use ultra-pure water machines to replace the previous distilled water machines. What are the advantages of ultra-pure water machines compared to distilled water machines? What is the principle of ultra-pure water machines? Is tap water or distilled water converted into ultrapure water? These are questions from many customers. In fact, ultra-pure water machines have become a trend to replace distilled water machines.