An extractant is a chemical reagent used to separate and extract organic or inorganic substances from a mixture. Since the purity of the extractant significantly affects experimental results, purity is a key factor to consider during selection. Generally, the purity requirements for extractants are as follows:

High Purity: High-purity extractants are typically required to prevent impurities from interfering with experimental results.

Chemically Pure (CP): Chemically pure extractants generally have a purity level exceeding 98%.

Analytical Reagent (AR) Grade: Analytical reagent grade extractants generally have a purity level exceeding 99% and are suitable for standard, routine experiments.

Ultrapure: Ultrapure extractants generally have a purity level exceeding 99.5% and are commonly used in high-sensitivity experiments and applications requiring high purity.