Distilled water, deionized water and bottled purified water are three kinds of water commonly used in our laboratory. For the difference of the three kinds of water, Dr. Q will introduce you to you:
Laboratory water
Distilled water
Distilled water refers to pure water prepared by distillation, which can be distilled once and repeatedly. The water is distilled once, the non-volatile components remain in the vessel and the volatile components enter the initial fraction of distilled water, usually only the middle portion of the fraction, about 60%.
To obtain purer water, an alkaline potassium permanganate solution can be added to the distilled water to remove organic matter and carbon dioxide. A non-volatile acid is added to make the ammonia a non-volatile ammonium salt. Since the glass contains a small amount of water-soluble components, it is necessary to use a quartz distillation vessel for two or more distillations to obtain very pure water, and the obtained pure water should be stored in a quartz or silver container. Pure water prepared by distillation is called distilled water.
Distilled water is the most widely used experimental water in the laboratory before the appearance of the purified water machine, mainly due to the lack of electrolyte and impurity content of distilled water.
Deionized water
Deionized water: As the name suggests, all the ions produced by the ionization of the electrolyte in water other than hydrogen ions and hydroxide ions are removed. That is, the electrolyte substance dissolved in water is removed. Since the ions generated by the ionization of the electrolyte in water can increase the conductivity of the water, the purity of the deionized water is naturally measured by the conductivity. Deionized water is basically obtained by ion exchange.
Deionized water index process and characteristics:
Deionized water is also more and more water used in laboratory applications. The quality of deionized water obtained by different processes is different. Process 1 obtains deionized water, and the water quality fluctuates greatly, especially when ion exchange resin tends to In the saturated state, the ion content in the produced water is increased, and the content of organic matter in the deionized water obtained in Process 1 is generally relatively high.
Process 3 is a technology used in more and more water purification equipment (Milli-Q secondary pure water adopts similar purification technology), and the adoption of EDI technology can make the content of ions in pure water more stable and the purification cost is greatly reduced. The obtained deionized water has very low ion content and organic content.
Bottled pure water
Bottled purified water is also used as experimental water by some experimental personnel. Strictly speaking, this is an irregular experimental water. Laboratory water is a chemical reagent commonly used in laboratories. The chemical reagents used in any experiment have certain quality standards. These quality standards meet the basic requirements of the experiment. Drinking water must contain trace elements necessary for humans, and the presence of these substances can interfere with the experimental results.
LC-MS experimental analysis
Next we look at the impact of different water quality on LC-MS background analysis:
From the experimental results, we can see that in the LC-MS analysis experiment, we need ultra-pure water with lower organic content to meet the experimental requirements.
Similarly, the storage of experimental water is also a concern we should pay attention to. Whether it is distilled water, deionized water or bottled water, it is a relatively clean water obtained by various purification techniques. These waters are highly susceptible to environmental pollution. If we don't store it properly, the pollutants will quickly enter the water, causing the water quality to drop, which will affect our experimental results. In order to avoid water quality problems caused by storage, more and more laboratories now purchase professional pure water equipment to prepare and store experimental pure water.
NVR Kit China's domestic level
China Telecom's Global Eye and the former China Netcom have developed remote video monitoring in conditional households. For example, the wide view video monitoring business has been launched in China Netcom's Shanxi, Shandong, Jilin, Zhejiang, Henan and other provincial companies in the early stage, and has been widely welcomed by customers. The wide view business has developed rapidly. In the first half of this year, only Hubei Netcom's "wide view - God's Eye" business has developed more than 500 households. With the rapid development of family information technology, users' demand for family security is becoming stronger and stronger, and the broad horizon will maintain rapid development. China Mobile is also developing mobile MMS monitoring represented by "Handyantong", and 3G video monitoring is also being tested and commercially tested. It is difficult to develop and promote home video surveillance because of the huge data and signal flow relying on the network and the need to deploy home gateways and cameras.
Video monitoring is mainly used in the communities closely connected with families in the industry field, but it is still less used for home monitoring. Under the guidance of the policy of safe cities and safe families, the domestic family monitoring will begin to rise with the continuous improvement of family network environment, the improvement of users' consumption ability, the growth of security awareness, and the increase of independent living families. The integrated video monitoring that integrates limited, wireless access and linkage alarm will become a development trend. Full service operation has arrived. Operators will certainly provide users with wired and wireless diversified technical monitoring means. Through business integration, they will bring users endless monitoring services. Monitoring realizes the discovery and prevention of family safety, and also reflects family care. In addition, efforts should be made to solve the problem of security. Therefore, family monitoring needs to gradually increase some new functions and applications such as linkage alarm and security services, such as emergency help, interaction with public security, medical care, housekeeping, and calling.
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