シリカ系イオン交換体を用いるイオンクロマトグラフィーの高性能化に関する研究
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概要
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A study on the application of both a HPLC silica-based anion-exchanger (TSKguardgel QAE-SW) and unmodified silica gels to conventional IC was carried out for the development of advanced ion chromatography (IC) for anions and cations. First, IC for anions with an anion-exchanger was investigated. Good separation and highly sensitive indirect-UV detection for inorganic anions (HCO_3^-, Cl^-, NO_2^-, NO3- and SO_4^<2->) were achieved by elution with either trimellitate or pyromellitate having strong eluent strength. This result indicates that some HPLC anion-exchangers are applicable to IC for anions when eluent ions having strong eluent strength are used. Second, IC for cations with unmodified silica gels was investigated. One kind of silica gel (Develosil 30-5) proved to act as a cation-exchanger under strongly acidic conditions. Good separation and highly sensitive conductimetric detection for common mono- and divalent cations (Li^+, Na^+, NH_4^+, K^+, Mg^<2+> and Ca^<2+>) was achieved by elution with either nitric acid/2,6-pyridinedicarboxylic acid or oxalic acid. The silica gel was also successfully applied to the ion-exclusion chromatographic separation of both aliphatic and aromatic carboxylic acids. Since it's cation-exchange property was attributed to be aluminium in the silica gel, a modification of silica gels with aluminium provided a newly advanced way to prepare novel silica-based cation-exchangers for IC. The IC methods developed here would contribute to expand the utility of IC for anions, cations and carboxylic acids.
- 社団法人日本分析化学会の論文
- 1999-01-05