比重式相分離器を用いた溶媒再利用型溶媒抽出法による鉄鋼中のヒ素の定量

概要

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An automated on-line solvent extraction system has been developed for the determination of arsenic in steels by electrothermal atomic absorption spectrometry (ET-AAS). It is based on the reaction of As(III) with iodide ion in the concentrated hydrochloric acid medium to produce AsI_3, which is extracted into benzene and back-extracted into water. Improved gravitational phase separator based on the previously proposed was developed for the recycling of organic solvent used in the automated on-line solvent extraction system. Using the proposed automated on-line solvent extraction system, arsenic contained in the acid decomposed steel sample solution was automatically extracted into the benzene phase and it was back-extracted into the water phase. Then, the back-extracted water phase was used for the determination of arsenic by ET-AAS. When the ET-AAS method was used for the determination of arsenic, 800 mg dm^<-3> of cobalt solution had to be used as the matrix modifier to remove an effect of coexisted substances such as iodide ion. In this method, a determination limit of As is 0.2μg in the 0.1 g of steel sample.
社団法人日本鉄鋼協会の論文