Views:6 Author:Site Editor Publish Time: 2019-08-29 Origin:Site
The quality levels of chemical reagents are numerous and varied, and they are particularly confusing. Generally, the conventional varieties (a type of reagent) are the necessary varieties, and there are 225 kinds. In Beijing, Tianjin, Shanghai, Xi'an, Chengdu, Guangzhou, and Shenyang, the chemical reagent bases are basically complementary production. The second type of reagents has about 1800~2000 varieties. It is used in almost all fields and is also a must-have for manufacturers. Such reagents are in great demand and widely used. There are about 3,000 to 6,000 varieties of the three types of reagents, and most of their fields of use are related to the national economy and the people's livelihood such as chemical, metallurgy, electric power, food, medical and health industries, and different industries need to use specific reagents.
In China, the chemical reagents are classified into three grades: pure grade, analytical grade and chemical purity. According to the national standards of the People's Republic of China and the original Ministry of Chemical Industry, there are 225 kinds of reagents. At the same time, because these 225 kinds of chemical reagents are widely used, they become the basic varieties.
These 225 chemical reagents form the basis of the chemical reagent content in China in standard form. The content of other chemicals is determined based on this and the content is determined by measurement. These 225 varieties have been marked in the chemical reagent list. In addition, there are special reagents, the production is very small, almost on-demand, the amount is generally specified by the user.
Excellent grade pure (GR, green label): high content of main components, high purity, suitable for **** analysis and research work, and some can be used as reference materials.
Analytically pure (AR, red label): high content of main components, high purity, low interference impurities, suitable for industrial analysis and chemical experiments.
Chemically pure (CP, blue label): high content of main components, high purity, interference impurities, suitable for chemical experiments and synthetic preparation.
Experimental pure (LR, yellow label): high content of main components, poor purity, impurity content is not selected, only suitable for general chemical experiments and synthetic preparation.
Indicators and stains (ID or SR, violet label): Requires unique sensitivity.
Designated Level (ZD): A chemical reagent ordered for a specific user according to the quality control indicators required by the user.
Electronic Pure (MOS): Suitable for the production of electronic products, the content of electrical impurities is extremely low.
Equivalent reagent (3N, 4N, 5N): the content of the main component were 99.9%, 99.99%, 99.999% or more.
In addition, it is still divided into the following 20 levels.
AAS atomic absorption spectroscopy, BC biochemical reagent, BP British Pharmacopoeia, BR biological reagent, BS biological staining agent, CR chemical reagent, EP special purity, FCP chromatography, FMP microscope, FS synthesis, GC gas chromatography, GR superior grade Pure reagent, HPLC high pressure liquid chromatography, ID indicator, IR infrared absorption spectrum, MAR micro analysis reagent, NMR nuclear magnetic resonance spectrum, OAS organic analysis standard, PA analysis, Pract internship, PT benchmark reagent, Puriss special, Purum Pure, SP Spectral Pure, Tech Industrial, TLC Thin Layer Chromatography, UP Ultrapure, USP US Pharmacopoeia, UV Ultraviolet Spectrophotometric Pure, JX Teaching Reagent, MI Pharmaceutical Grade, I Industrial Grade, F Food Grade, M Makeup Grade, S Solid, L liquid, E boutique, C crude
With the rapid development of science and technology, the current quality standards of these chemical reagents are generally divided into the above-mentioned several quality levels, which are far from meeting the needs of scientific research and production.