The main differences between pure water and pure water are:
From an academic point of view, pure water, also known as high-purity water, refers to water with extremely high chemical purity. It is mainly used in the fields of biology, chemistry, chemical industry, metallurgy, aerospace, and power. The electronics industry is still common. For example, the pure water used in the power system requires that the content of each impurity be as low as "micrograms / liter".
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In the production of pure water, the indicators specified in the water quality standards should be determined according to the production process of electronic (microelectronic) components (or materials) (such as the size of the particulate material that generally causes circuit performance damage to its line width) 1 / 5-1 / 10), but due to the complexity of microelectronics technology and many factors that affect the quality of products, there is no complete water quality standard applicable to the production of a certain circuit obtained by process testing. Electronic grade water standards are constantly being revised, and many breakthroughs and developments in the field of high-purity water analysis, the continuous application of new instruments and new analysis methods have created conditions for the development of water-making processes.
The national standards for high-purity water are: GB1146.1-89 to GB1146.11-89 . At present, China's high-purity water standards divide electronic-grade moisture into five levels: Class I, Class II, Class III, Class IV, and Class V , The standard was developed with reference to ASTM electronic standards.
The main basis of the indicators specified in the water quality standards of high-purity water are: 1. The requirements of microelectronic technology on water quality; 2. The level of water-making technology; 3. The status of detection technology.
In the production process of high-purity water, the anions and cations in the water can be removed by electrodialysis, reverse osmosis and ion exchange resin technology
Particles in water can generally be removed by ultrafiltration, membrane filtration, etc.
Bacteria in the water are currently removed in China by dosing, ultraviolet irradiation or ozone sterilization
TOC in water is generally treated with activated carbon and reverse osmosis.
In the field of high-purity water applications, the purity of water is directly related to the performance, reliability, and threshold voltage of the device, which leads to low breakdown, defects, and also affects the minority carrier life. Therefore, high-purity water requires considerable purity and accuracy.
The main reason why high-purity water can not be used as drinking water is that the dissolved gases in natural water mainly include O2, CO2, SO2 and a small amount of CH4, radon, chlorine, etc. In the production process of high-purity water, such gases must also be removed. In order to effectively remove impurities, in the process of producing high-purity water, some chemical bactericides, such as formaldehyde, hydrogen peroxide, sodium hypochlorite, etc., are added.
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