There are many kinds of Basic Chemicals reagents, and their classification methods have not been unified internationally.
Different standards are also classified.
1. the 1 grades of chemical reagents are divided into four categories: standard reagents, biochemical reagents, electronic reagents, and experimental reagents.
Standard reagent BZ: in accordance with international standards and technical requirements, it is clearly defined as the standard substance for analysis of arbitration.
Biochemical reagent SH: preparation of biochemical tests and biochemical synthesis.
Electronic reagent DZ: generally refers to the chemicals and materials used in the electronic information industry, mainly including chemicals for integrated circuits and discrete devices, chemicals for printed circuit boards, chemicals for surface assembly, and chemicals for display devices.
Experimental reagent SY: "synthetic reagent" determined according to the "main content". Experimental reagents are used in chemical laboratory to synthesize common reagents which can be prepared, separated and purified and meet the requirements of synthetic technology.
2 classification by "use chemical composition"
Many foreign reagent companies, such as E. Merck of Germany, FLuKa of Switzerland, Kanto Chemical of Japan and China's reagent catalogue, adopt this classification method.
The catalogue of chemical reagent management compiled in 1981 in China divides more than 8500 reagents into ten categories, each of which is subdivided into several subcategories.
Inorganic analytical reagent (Inorganic Analyticl reagents)
Inorganic chemicals used for chemical analysis, such as metals, nonmetallic elements, oxides, alkalis, acids, salts and other reagents.
Organic classification reagent (Organic Analyticl reagents)
Organic chemicals, such as hydrocarbons, aldehydes, ketones, ethers and their derivatives, used for chemical analysis.
special reagent (Specific reagents)
Some special organic reagents for determination, separation and enrichment of elements in inorganic analysis, such as precipitator, chromogenic reagent, chelating agent, etc. These reagents are highly sensitive and selective.
Benchmark reagent (Primary standards)
It is mainly used to calibrate the concentration of standard solution. The characteristics of these reagents are high purity, less impurities, good stability and constant chemical composition.
Standard substance (Standard substance)
A chemical standard for comparison in chemical analysis, instrumental analysis, or for calibration of instruments.
Indicator and test paper (Indicators and test papers)
It is used to indicate the end point of titration in titration analysis or to test some reagents in gas or solution. A strip of paper that impregnated with indicator or reagent solution is a test paper.
Instrument analytical reagent (Instrumental analytical reagents)
Reagents for instrumental analysis.
Biochemical reagent (Biochemical reagents)
Reagents for life science research.
High purity substance (High purity material)
Used as materials for some special needs industries (e.g. electronic industry raw materials, single crystals, optical fibers) and some trace analysis reagents. Its purity is generally more than 4 "9" (99.9%) and impurities are controlled at one millionth or even ppb level.
LCD (Liquid crystal)
Liquid crystal is the abbreviation of liquid crystal. It has not only the characteristics of fluidity, surface tension and other liquid, but also the characteristics of optical anisotropy, birefringence and other solid crystals.
3. according to "use subject" classification
In 1981, the Chinese Society of Chemical Reagents provided ammonium reagents for use and subject classification. The reagents were divided into eight categories and several subcategories.
Under the General inorganic reagent, general organic reagents, teaching reagents and other 8 sub categories.
High purity reagent
It is divided into 11 subgroups, such as benchmark and standard reagent, sensitive reagent for inorganic analysis and special reagent for organic analysis.
Special reagent for instrumental analysis
There are 7 subclasses of chromatographic reagents, NMR reagents, UV and IR spectrometers.
Reagent for organic synthesis research
It is divided into 8 subclasses: basic organic reagents, protective gene reagents, and phase transfer catalysts.
Clinical diagnostic reagent
It is divided into 7 sub categories: General reagents, biochemical reagents, radioimmunoassay reagents and so on.
It is divided into 13 subclasses: alkaloids, amino acids and their derivatives.
New basic materials and fine chemicals
It is divided into 7 sub categories: chemicals for electronic industry, chemicals for optical industry, chemicals for pharmaceutical industry, etc.
In addition, chemical reagents can also be divided into high-purity reagents, high-grade reagents, analytical reagents of chemical purity reagents; or according to the requirements of reagent storage can be divided into easily deteriorating reagents, chemical dangerous reagents and general storage reagents.
4. according to the amount of impurities, it can be divided into four grades:
The first grade reagents are high quality pure reagents, usually expressed by G. R.
The two grade reagent is analytically pure reagent, usually expressed by A. R.
The three grade reagent is chemically pure reagent, usually expressed by C. R.
The four grade reagent is an experimental or industrial reagent, usually expressed by L. R.
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