The difference between pure water and ultrapure water exists in many aspects:

In modern experiments, laboratory pure water plays an increasingly irreplaceable role. Pure water instruments are also widely used as the basic configuration of laboratories.

Pure water, also known as purified water, refers to water that meets the sanitary standards for drinking water as raw water, and is produced through electrodialyzer method, ion exchanger method, reverse osmosis method, distillation method and other appropriate processing methods. No additives, colorless and transparent, drinkable water. Some bottled water and distilled water sold on the market fall into the purified water category.

Ultrapure water is based on pure water and further removes the conductive medium in the water almost completely, and removes the non-dissociated colloidal substances, gases and organic matter in the water to a very low level. The resistivity is equal to or close to the 18.2MΩNaN (25℃) limit value.

①The conductivity is different. The conductivity of pure water is generally between 2-10us/cm, and the conductivity of ultrapure water is 0.05us/cm. The indicators such as the number of organic matter, bacteria, and particles are also very different. For example, pure water with organic matter is More than tens of ppb, while ultrapure water is several ppb. Simply put, there are no impurities in ultrapure water, which is close to theoretical water.

② The difficulty of manufacturing is different. The pure water currently used on the market is basically produced by reverse osmosis and distillation, while ultrapure water is based on pure water and also undergoes ultraviolet oxidation technology (185nm). ), nuclear-grade resin treatment, microfiltration and ultrafiltration and a series of complex purification technologies.