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Citation: Man He, Beibei Chen, Bin Hu. Deepen the Understanding of “Distribution Fraction” with Separation/Enrichment of Arsenic Species as Examples[J]. University Chemistry, ;2021, 36(6): 200603. doi: 10.3866/PKU.DXHX202006036 shu

Deepen the Understanding of “Distribution Fraction” with Separation/Enrichment of Arsenic Species as Examples

College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China

Corresponding author: Bin Hu, binhu@whu.edu.cn
Received Date: 8 June 2020

Based on the dissociation equilibrium constants of six arsenic species, including arsenic acid, arsenite, monomethyl arsenate, dimethylarsenic acid, arsenicone and betaine, and corresponding distribution fraction at different pH, the retention differences in chromatographic/non chromatographic separation process, and the possible reasons for simultaneous enrichment of these species are discussed. It was used as an example to improve the teaching of the basic concept of "distribution score" in the course of analytical chemistry, and to achieve the teaching goal of deepening cognition, firmly mastering and stimulating interest.
- Distribution fraction,
- Dissociation equilibrium constant,
- Arsenic species,
- Analytical chemistry
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