Generally used for dialysis and other medical water, or laboratory, electronic chemical and other special water. Water (H2O) that does not contain organic pollutants, inorganic salts, any additives, various impurities and other impurities or bacteria is raw water.
Pure water can be made by electrodialysis, ion exchange, reverse osmosis, distillation and other appropriate treatment methods. It is sealed in a container, without any additives, colorless and transparent, and can be directly drunk.
Extended data:
The national standards for high purity water are GB1146.1-89 to GB1146.1-89 [168]. ASTM At present, China's high-purity water standard divides electronic water into five grades.
In the field of high pure water application, the purity of water is directly related to the performance, reliability and threshold voltage of devices, which leads to material breakdown, defects and short minority carrier lifetime. Therefore, high purity and precision are required.
The main reason why high purity water can't be used as drinking water is that the gases dissolved in natural water mainly include O2, CO2, SO2 and a small amount of CH4, radon and chlorine. In the production of high purity water, it is necessary to remove these gases. In order to effectively remove impurities, some chemical fungicides, such as formaldehyde, hydrogen peroxide and sodium hypochlorite, are added in the process of producing high purity water.
Baidu encyclopedia -RO pure water