First, what are the classification of chemical reagents
There are thousands of chemical regent products, which are relative standard substances for chemical research and component analysis, and important conditions for scientific and technological progress. They are widely used in the synthesis, separation, qualitative and quantitative analysis of substances. They can be said to be the eyes of chemical workers, in the daily work of factories, schools, hospitals and institutes. You can't do it without chemicals. Usually they are divided into inorganic chemical reagents, organic chemical reagents and biochemical reagents three categories. But all kinds of chemical reagents at the same time because of the difference in purity, impurity content, use, and so on, there are multiple levels.
Second, how is the grade of chemical reagents divided
Domestic chemical reagents are generally divided into four levels according to the amount of impurities:
1. LR reagent:
Laboratory reagent, a four-grade reagent, abbreviated LR.
2. CP reagent:
Chemical pure reagent, tertiary reagent, abbreviated CP, general bottle with dark blue label.
3. AR reagent:
Analytial reagent, pure analytical reagent, secondary reagent, abbreviated as AR, general bottle with red label.
4. GR reagent:
Guaranteed reagent, also known as guaranteed reagent, is a first-grade reagent, abbreviated as GR, and is generally labeled with a green label on the bottle.
In addition to the above four commonly used levels, there are still:
Reference reagent:
Primary reagent, PT for short. The standard solution can be prepared directly and specially used as a reference material.
Spectroscopic pure reagent:
Spectrum pure, SP for short. However, because the organic matter can not be shown on the spectrum, sometimes the principal component can not reach more than 99.9%, and it must be paid attention to when used, especially when it is used as a benchmark, it must be calibrated.
Main uses of chemical reagents at all levels:
GR: Guaranteed reagent, pure grade. The main component content is very high, high purity, suitable for accurate analysis and research work, and some can be used as a reference material.
AR: Analytial reagent. High main component content, high purity, low interference impurities, suitable for industrial analysis and chemical experiments.
CP: Chemical pure. Cp: Chemical pure. High main component content, high purity, there are interference impurities, suitable for chemical experiments and synthetic preparation.
LR: Laboratory reagent, experimental pure. The main component content is high, the purity is poor, the impurity content is not selected, and it is only suitable for general chemical experiments and synthetic preparation.
BR: Biological reagent. Used for preparation of biochemical test solution and biochemical synthesis. The quality index focuses on bioactive impurities. Alternative to indicator and organic synthesis.
BS: Biological stain. Suitable for preparation of biological specimen dyeing solution. The quality index focuses on bioactive impurities. Alternative to indicator and organic synthesis.
Ind: Indicator, color developing agent.
HPLC: High performance liquid chromatography, reagent suitable for high pressure liquid chromatography.
Classification of imported chemical reagents:
Ultra Pure: Ultra pure, similar to the GR level.
High Purity: High purity, similar to AR grade.
Biotech: Biotechnology grade, similar to BR grade.
Reagent: Reagent grade, similar to CP grade.
ACS: American Chemical Society standard, similar to AR class.
USP: Pharmaceutical grade.