基于砷形态的分离/富集加深学生对“分布分数”的理解

doi:10.3866/PKU.DXHX202006036

Abstract

Abstract:

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.

Key words: Distribution fraction, Dissociation equilibrium constant, Arsenic species, Analytical chemistry

MSC2000:

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): 2006036.

形态	pK_a1	pK_a2	pK_a3
亚砷酸As(Ⅲ)	9.23	12.1	13.4
砷酸As(Ⅴ)	2.19	6.98	11.5
单甲基砷酸(MMA)	4.1	8.7
二甲基砷酸(DMA)	6.2
砷甜菜碱(AsB)	2.18

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

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