火焰原子吸收分析中表面活性剂对锰吸收讯号的增感效应及机理

Mechanism of Enhancement of Surfactants on Manganese in Flame Atomic Absorption Spectrometry

提出了一种新的增感机理:在表面活性剂的cmc前,气溶腔形成过程中被测离子在小液滴上富集产生增惑;cmc后富集作用减小,但被测离子和表面活性剂形成胶团化物产生新的增感,火焰部分表面活性剂的不完全燃烧增强了火焰的还原性是增感因素之一。

A new enhancing mechanism of surfactants in FAAS is proposed. This paper narrates that below the cmc of surfactants, the enhancement results primarily from enrichment of analyte in small droplets of aerasols because of the surface effect of surfactants, and above the cmc, the enrichment is getting less and less, and the new enhancement results from the binding of analyte to micellae in bulk. And in flame, amplifying of reductive environment because of the incomplete burning of surfactants is always one of the enhancing factors.