What are the standards for water used in laboratories?
Thread Content
Is it necessary to use ultra-pure water for laboratory purposes? Can the deionized water produced by the reverse osmosis system in the workshop’s water treatment facility be used?
Laboratory water is classified into three grades: one, two, and three. Grade 3 water is the most commonly used, while grade 2 water is sufficient for general analytical purposes. It can be obtained through distillation or ion exchange methods.
The visual appearance of water used in analytical laboratories should be that of a colorless and transparent liquid. The raw water used for analytical laboratory purposes should be drinking water or water of appropriate purity. Laboratory water for analysis is divided into three grades: grade 1 water, grade 2 water, and grade 3 water. Grade 1 water is used for analytical tests with strict requirements, including tests that have specifications for particles, such as water for high-performance liquid chromatography analysis. Grade 1 water can be produced by treating grade 2 water through distillation in quartz equipment or treatment in ion exchange resins, followed by filtration through a 0.2 μm microporous filter membrane. Grade 2 water is used for tests such as inorganic analysis, including as water for atomic absorption spectroscopy. Grade 2 water can be produced by methods such as multiple distillations or ion exchange. Grade 3 water is used for general chemical analysis tests. Grade 3 water can be produced by methods such as distillation or ion exchange. I hope this can help you. If you need to discuss anything further, you can add me on WeChat at 949872428, BOBO.
The deionized water used in our laboratory is only for cleaning glass instruments; distilled water prepared by ourselves is still used when preparing solutions.