保持の弱いイオン種のイオンクロマトグラフィーにおけるシリカODSカラムとテトラ-n-ブチルアンモニウム塩イオン対試薬の利用

概要

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In an ion-chromatography of bromate, nitrite and bromide which are early eluting anions among common inorganic anions, highly efficient anion-exchange columns were widely used for their separations ; these are of much expensive columns. Silica octadecylesilane (ODS) columns are cheaper compared with the anion-exchange columns, and these ODS columns can be used for separations of molecular compounds and ion-paired species. Therefore, if an ion-paring reagent for bromate, nitrite and bromide could be found out, silica ODS columns is expected to be applicable to separations of these anions as ion-paired species. In this work, tetra-n-buthylammonium (TBA) salt has been found to be useful as an ion-pairing agent in order to separate the three anions on a silica ODS column. In this case, each anion reacts with TBA to form ion-pair species, then the species are resolved on the column. When an aqueous solution containing 5 mM TBA, 14 mM sodium chloride and 7.5 % (v/v) acetonitrile was used as a mobile phase and pumped at 1.0 ml min^<-1>, three anions of bromate, nitrite and bromide were resolved within 14 min. Their chromatograms obtained were in good shape. Consequently, TBA ion-pairing reagent and silica ODS column have been found to be applied successfully to the complete separation of bromate, nitrite and bromide ions in their mixtures.
東海大学の論文
2004-03-30