含氧阴离子的离子色谱法研究

 在含有阴、阳离子双官能团的色谱柱上 ,用两种浓度的Na2 HPO4洗脱液分别同时分离了 5种和 7种含氧阴离子 ,并且实现了元素不同价态的分析。 7.5mmol/LNa2 HPO4( pH 9.3)适于同时分离SeO32 - ,HAsO42 - ,SeO42 - ,WO42 - ,MoO42 - ,GeO32 - 和CrO42 - ;0 .75mmol/LNa2 HPO4(pH 9.3)适于同时分离IO3- ,H2 AsO3- ,BrO3- ,NO2 - 和NO3- ;检测波长为 2 0 4nm。另外 ,选择其它 4种阴离子色谱柱进行比较 ,对分离机理进行了初步的研究。

Study on the Separation of Trace Oxoanionsby Ion Chromatography

It was the first time that bifunctional ( cation exchange/anion exchange) stationary phase was used for the analysis of trace oxoanions by ion chromatography. The influence of sodium phosphate concentration and eluent pH on their separations was studied. An eluent of 7.5 mmol/L Na 2HPO 4(pH 9.3) was found to be the most suitable for the analysis of SeO 3 2- ,HAsO 4 2- ,SeO 4 2- ,WO 4 2- ,MoO 4 2- ,GeO 3 2- and CrO 4 2- simultaneously. An eluent of 0.75 mmol/L Na 2HPO 4(pH 9.3) was found to be the most suitable for the analysis of IO 3 -,H 2AsO 3 -,BrO 3 -,NO 2 - and NO 3 - simultaneously. The detection wavelength was 204 nm. Four other anion separation columns (AS4A SC, AS9 SC, AS11 and PAX 500), which had different structures and properties, were compared to CS5A column. The separation mechanism was also studied.