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What are the categories of chemical reagent purity?
Author:
Chemical reagents are typically classified into four primary grades: Grade Reagent (GR), Analytical Reagent (AR), Chemically Pure (CP), and Laboratory Reagent (LR).
Detailed Explanation of the Four Main Tiers
Extra Pure (GR): Highest purity (≥99.8%) and lowest impurity content; green label; suitable for precision analytical experiments and scientific research.
Analytical Reagent (AR): High purity (≥99.7%), indicated by a red label on the bottle, primarily used for quantitative analysis and general scientific research experiments.
Chemically Pure (CP): Purity ≥ 99.5%; blue label; suitable for routine chemical experiments and syntheses.
Laboratory Reagents (LR): Relatively low purity, identified by yellow labels on the bottles, and typically used in teaching experiments and other applications where high precision is not required.
In addition to the four common grades mentioned above, there are also several specialized purity classifications based on different experimental methods and precision requirements, such as:
Chromatography-grade: Used for chromatographic analysis, with extremely low impurity peaks.
Spectroscopic grade: Suitable for precision instrumental analyses such as atomic absorption spectroscopy.
Primary reference standards: can be used directly to prepare standard solutions.
High-purity reagents: purity ≥ 99.99%, used for trace analysis and other applications.
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What are the categories of chemical reagent purity?
Chemical reagents are typically classified into four primary grades: Grade Reagent (GR), Analytical Reagent (AR), Chemically Pure (CP), and Laboratory Reagent (LR).
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