Chemical reagent

Chemical reagents, commonly referred to as reagents, are a large class of purified substances with various standard purities. They are used in education, scientific research, analytical testing, and as functional materials and raw materials required by some new industries. Fine chemical products. There are many kinds of chemical reagents, and hundreds of thousands have been used internationally. There are also tens of thousands of them used in daily life in China. There are no uniform regulations on the classification of chemical reagents, and they are customarily divided into disciplines and practical uses. Take the representative catalogue of the German company E. Merck as an example. There are twelve categories and seventy classes. Most countries are divided by application scope. We divided the reagents into four categories. 1. General Reagent: Refers to organic and inorganic reagents that meet standard purity. Often used as scientific research, analytical testing, synthetic reactions and as a new material. 2. Analytical reagents: Reagents designed for analytical testing in two sub-categories: (1) Chemical analysis reagents: Test items for chemical reaction analysis. 1) Reference Reagent: A pure compound that is used directly to formulate or calibrate a standard solution in a volumetric analysis. 2) Indicator: A reagent used to indicate the end point of the titration, divided into a pH indicator, a redox indicator, an adsorption indicator, a metal indicator, a fluorescent indicator, and the like. (2) Instrumental analysis reagents: High-purity compounds designed for instrumental analysis. 1) Spectral Pure Reagent: A spectrally pure compound, often expressed in SP, for reagents for spectroscopic analysis. 2) Chromatographic reagents: reagents for gas chromatograph analysis and for liquid chromatograph analysis. 3) Deuterated reagent: A reagent dedicated to the analysis of nuclear resonance instruments. 3. Electronics Industry Reagents: Specialty chemical products for the electronics industry. 1) MOS Reagent: The particle concentration is in accordance with ASTM “O” grade and is a special reagent for microelectronics. 2) High-purity reagent: also known as ultra-high purity reagent, such as purity of 99.99%, called 4N, 99.999% called 5N, generally used for scientific research and physical chemical trace analysis, fiber optic communication, microelectronics, semiconductor, laser and many more. 3) In addition, there are fine chemical products with special properties such as optical pure reagents and photoresists. 4. Biochemical reagents: biochemical reagents, which are the basic chemical substances of organisms extracted or chemically synthesized by organisms, and are a major class of reagents. As an important reagent for the research and analysis of biological components. Including clinical immunological reagents, genetic engineering reagents, cell culture reagents, hormonal substances, reagents for carcinogenicity of toxic substances, reagents for anti-mildew and insecticidal research, in short, it is a reagent for exploring scientific research and testing of life mysteries, disease prevention, etc. It is a pure compound that involves medicine and pharmacy.