The difference between chemical pure and analytical pure

In the chemical industry, the purity identification of reagents is very important. Among them, chemical purity (Chemical Pure) and analytical purity (Analytical Pure) are two common purity levels, which are easy to confuse. This article will analyze the difference between the two in detail to help readers correctly understand and select reagent purity.

1. Purity Grade Definition and Background

The division of reagent purity is mainly based on the source of the substance, the preparation process and the purity requirement. Chemical purity and analytical purity are two common grades, corresponding to different preparation methods and usage scenarios.

Chemically pure substances are usually derived from chemical synthesis processes, such as the synthesis of desired substances by chemical reactions. For example, many organic compounds need to be prepared by multi-step chemical reactions, and the final purity of these substances depends mainly on the control ability of the chemical synthesis process.

Analytically pure substances are mostly derived from natural minerals or by-products of industrial processes, such as metals and ores. These substances undergo a physical or chemical purification process to remove impurities and form reagents that meet analytical purity standards.

Source and Process Differences

Chemically pure production processes usually use chemical synthesis, which requires high technical control and process stability. Chemically pure substances have high chemical stability and are suitable for experiments and production scenarios where specific chemical properties are required.

Analytically pure substances are mostly derived from physical extraction, for example, fixed bed by heavy potassium carbonate (K2CO3) fixed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed bed