Purity of chemical reagents The purity of chemical reagents is still classified in China:
National Standard Reagents: These reagents are stipulated by China's national standards and are applicable to inspection, identification and testing.
Reference reagent (JZ, green label): As a reference substance, the standard solution is calibrated.
Excellent grade pure (GR, green label) (first grade): High content of main components, high purity, suitable for accurate analysis and research work, and some can be used as reference materials.
Analytically pure (AR, red label) (secondary product): High content of main component, high purity, low interference impurities, suitable for industrial analysis and chemical experiments.
Chemically pure (CP, blue label) (third grade): 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 for general chemical experiments and synthetic preparation.
Teaching reagents (): A class of reagents that can meet the teaching objectives of students and do not cause deviations in chemical reaction phenomena.
Designated level (ZD), which is a chemical reagent ordered for a specific user according to the quality control indicators required by the user.
High Purity Reagent (EP): including ultra-pure, ultra-pure, high-purity, spectrally pure, standard solution. The quality of such reagents is concerned with the fact that during the analysis of a particular method, the deviation of the analytical results may be caused, and the impurity content of the component analysis or the content analysis may be disturbed, but the main content is not required to be high.
Chromatographic purity (GC): dedicated for gas chromatography analysis. The quality indicators focus on impurities that interfere with the peaks of the gas chromatogram. The content of the main component is high.
Chromatographic Purity (LC): A standard material for liquid chromatography analysis. The quality indicators focus on impurities that interfere with the peaks of the liquid chromatography. High content of main components
Indicator (ID): For the preparation of the indicator solution. The quality indicators are the range of discoloration and the sensitivity of discoloration. It can be used in place of CP and is also suitable for organic synthesis.
Biochemical reagent (BR): Preparation of biochemical test solution and biochemical synthesis. Quality indicators focus on biologically active impurities. An alternative indicator for organic synthesis
Biological stain (BS): Preparation of microbial specimen staining solution. Quality indicators focus on biologically active impurities. An alternative indicator for organic synthesis
Spectral purity (SP): for spectral analysis. Suitable for spectrophotometer, atomic absorption spectroscopy, atomic emission spectroscopy
Electronic Pure (MOS): Suitable for the production of electronic products, the content of electrical impurities is extremely low.
Equivalent reagent (3N, 4N, 5N): The main component contents are 99.9%, 99.99%, and 99.999%, respectively.
Electrophoresis reagent: The quality index focuses on the control of electrical impurity content.
In addition, there are special reagents, the production is very small, almost on-demand, the quantity and quality of such reagents are generally specified by the user.
To put it simply, the purity of the analysis is slightly higher than that of the chemically pure ones, but it is not necessarily the number of nines that are purely analytical. According to different reagents, it is divided according to the national standard.
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