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The difference between pure water and ultrapure water and their preparation methods


Compared with household pure water equipment, the use of laboratory water equipment requires more stringent requirements. Laboratory water is usually divided into first-class water, second-class water, and third-class water.

1. Differences and uses of pure water and ultrapure water

Pure water:

Pure water refers to raw water that meets drinking water specifications. Ultrapure water can be effectively produced through electrodialysis, ion exchange resin, and reverse osmosis. The prepared water is in a sealed container without any additives. In the experiment Use more. The conductivity of pure water equipment is usually between 1-50μs. Pure water is required for cleaning the main glassware in the laboratory, high-pressure sterilization, constant temperature and humidity and other water-using equipment.

Ultra-pure water:

Ultrapure water is also called first-grade water. The water quality is purer and close to the theoretical limit. It can reduce the resistivity, organic matter, particulate matter, bacteria and other contents to the purity limit. Ultrapure water can be used as experimental water, especially for gas-liquid phase, disease control, pharmaceutical standard laboratories and various high-end precision instruments.

2. Preparation methods of pure water, high-purity water and high-purity water

How to prepare pure water

At a minimum, pure water needs to be able to be produced by weak base anion exchange or reverse osmosis and single distillation.

Preparation method of ultrapure water

Ultrapure water refers to pre-purification of water through ion exchange, RO membrane or distillation, and then purification through nuclear-level ion exchange to obtain ultrapure water.

Tags: water · pure water · ultrapure water