The purity of biochemical reagents in China is still divided into:
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National standard reagent: This type of reagent is prescribed by China's national standards and is suitable for inspection, identification and testing
Reference reagent (JZ, green label): As a reference substance, calibrate a standard solution.
Premium grade pure (GR, green label) (first grade product): The content of main ingredients is high and the purity is very high. It is suitable for accurate analysis and research work, and some can be used as a reference substance.
Analytical purity (AR, red label) (secondary product): The content of the main components is high, the purity is high, and the interference impurities are very low. It is suitable for industrial analysis and chemical experiments.
Chemically pure (CP, blue label) (third grade): High content of main components, high purity, presence of interfering impurities, suitable for chemical experiments and synthetic preparation.
Experimental purity (LR, yellow label): The main ingredient content is high, the purity is poor, the impurity content is not selected, only suitable for general chemical experiments and synthetic preparation.
Teaching reagents (): A class of reagents that can meet the teaching purpose of students without causing deviations in chemical reaction phenomena.
Specified grade (ZD), this kind of reagent is a chemical reagent customized for a specific user according to the quality control indicators required by the user.
High-purity reagents (EP): including ultra-pure, ultra-pure, high-purity, and spectrally pure, prepare standard solutions. The quality of this type of reagents focuses on: during the analysis of a particular method, it may cause deviations in the analysis results, and the content of impurities that interferes with component analysis or content analysis, but does not make high requirements for the main content.
Chromatographically pure (GC): dedicated for gas chromatographic analysis. Quality indicators focus on impurities that interfere with gas chromatographic peaks. High content of main ingredients.
Chromatographically pure (LC): liquid chromatography analysis of reference materials. Quality indicators focus on impurities that interfere with liquid chromatography peaks. High content of main ingredients
Indicator (ID): used to prepare indicator solution. The quality indicators are the range of color change and the sensitivity of color change. Can replace CP, also suitable for organic synthesis.
Biochemical reagent (BR): prepare biochemical test solution and biochemical synthesis. Quality indicators focus on biologically active impurities. Can replace indicator, can be used for organic synthesis
Biological staining agent (BS): prepare microbial specimen staining solution. Quality indicators focus on biologically active impurities. Can replace indicator, can be used for organic synthesis
Spectral purity (SP): used for spectral analysis. Applicable to spectrophotometer standard, atomic absorption spectrum standard, atomic emission spectrum standard respectively
Electronic pure (MOS): suitable for the production of electronic products, the content of electrical impurities is extremely low.
Equivalent reagents (3N, 4N, 5N): The main component content is 99.9%, 99.99%, and 99.999% respectively.
Electrophoresis reagents: quality indicators focus on the control of electrical impurity content.
In addition, there are special reagents, the production volume is extremely small, and the production is almost on demand. The quantity and quality of such reagents are generally specified by users.
To put it simply, analytical purity is slightly higher than chemical purity, but it is not necessarily analytically pure. It must be as many as nine, according to different reagents, divided by national standards.
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