Purity of reagents

High-purity reagents (≥99.99%)
The purity of reagents is an important indicator of their quality, which directly affects the accuracy and reliability of experimental results. The following is a detailed analysis of reagent purity: ‌

1. ‌Basic classification of reagent purity‌
‌High-purity reagents (EP): purity ≥99.99%, extremely low impurity content, suitable for trace analysis and high-precision experiments.
‌Superior purity (GR): purity ≥99.8%, suitable for precision analysis and scientific research, marked with green bottle labels.
‌Analytical purity (AR): purity ≥99.7%, suitable for important analysis and general research, marked with red bottle labels.
‌Chemical purity (CP): purity ≥99.5%, suitable for general analysis work, marked with blue labels.
‌Experimental reagents (LR): purity is lower, suitable for general chemical experiments and synthetic preparations.
2. Special Purpose Reagents

Benchmark Reagents (PT): used to calibrate standard solutions and used as reference substances.

Spectral Purity Reagents (SP): used for spectral analysis, but it should be noted that organic substances may not appear completely pure on the spectrum.

Chromatographic Purity (GC/LC): used for gas chromatography and liquid chromatography analysis, respectively, focusing on the control of impurities that interfere with chromatographic peaks.

Electronic Purity (MOS): suitable for the production of electronic products, with extremely low levels of electrical impurities.

3. Features and Applications of High Purity Reagents

Features: High purity reagents are produced using special processes for specific purposes, and their impurity content is several orders of magnitude lower than that of premium purity.

Applications: suitable for trace analysis, high purity chemicals for optics and electronics, metal-oxide-semiconductor electronics industry and other fields.

4. Recommendations on the Selection of Reagent Purity

Precision Analysis: Choose high purity reagents or premium purity reagents to ensure the lowest impurity content.

General Analysis: Analytical purity or chemical purity reagents can meet the needs.
‌Teaching experiment‌: Experimental reagents or teaching reagents are sufficient for use.
5. ‌Precautions‌
‌Quality standard‌: The quality standard of high-purity reagents is not yet unified. The names may include high purity, extra purity, ultrapure, etc., which need to be selected according to specific needs.
‌Identification and labeling‌: Reagents of different purities are usually distinguished by the color of the bottle label, such as green (superior purity), red (analytical purity), blue (chemical purity), etc.
Through the above classification and analysis, we can better understand the division of reagent purity and its application scenarios, so as to make more appropriate choices in experiments.