How to classify chemical reagents

There are thousands of chemical reagent products, which can be divided into general reagents, standard reagents, high-purity reagents, special reagents, indicators and test strips, organic synthesis reagents, biochemical reagents, clinical reagents, etc. Here are just a few of them:
1. General reagents: General reagents are the most commonly used reagents in laboratories, and can be divided into four grades according to their impurity content.
2. Standard reagent: Standard reagent is a standard substance for measuring the chemical quantity of other (to be measured) substances, which is characterized by high main content and accurate and reliable. Standard reagents are generally produced by large reagent factories and tested in strict accordance with national standards.
3. High-purity reagents: The main content of high-purity reagents is equivalent to that of superior-grade pure reagents, but the impurity content is lower than that of superior-grade pure reagents and benchmark reagents, and the impurity items specified for detection are 1~1 more than those of the same kind of superior-grade pure reagents or benchmark reagents. 2 times. High-purity reagents are mainly used for the decomposition of samples and the preparation of test solutions in micro or trace analysis. High-purity reagents also belong to general-purpose reagents, such as HCl, HF, HClO4, HNO3, H2SO4, etc.
4. Special reagents: Special reagents are reagents with special purposes. Similar to high-purity reagents, special reagents not only have high main body content, but also have very low impurity content; different from high-purity reagents, impurity components that interfere in specific uses only need to be controlled below the limit that will not cause obvious interference. The reagents used in the analysis of similar instruments, such as standard reagents for chromatographic analysis, gas chromatography carriers and stationary solutions, liquid chromatography fillers, thin-layer analysis reagents, pure reagents for ultraviolet and infrared spectroscopy, and reagents for magnetic resonance spectroscopy are all special reagents.