Liu Yong-Qiang, Yu Hong
College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, China.
J Sep Sci. 2017 Apr;40(8):1660-1666. doi: 10.1002/jssc.201601297. Epub 2017 Mar 21.
A convenient and versatile method was developed for the separation and detection of alkaline earth metal ions by ion chromatography with indirect UV detection. The chromatographic separation of Mg , Ca , and Sr was performed on a carboxylic acid base cation exchange column using imidazolium ionic liquid/acid as the mobile phase, in which the imidazolium ionic liquid acted as an UV-absorption reagent. The effects of imidazolium ionic liquids, detection wavelength, acids in the mobile phase, and column temperature on the retention of Mg , Ca , and Sr were investigated. The main factors influencing the separation and detection were the background UV absorption reagent and the concentration of hydrogen ion in ion chromatography with indirect UV detection. The successful separation and detection of Mg , Ca , and Sr within 14 min were achieved using the selected chromatographic conditions, and the detection limits (S/N = 3) were 0.06, 0.12, and 0.23 mg/L, respectively. A new separation and detection method of alkaline earth metal ions by ion chromatography with indirect UV detection was developed, and the application range of ionic liquids was expanded.
开发了一种便捷通用的方法，用于通过离子色谱间接紫外检测法分离和检测碱土金属离子。在羧酸基阳离子交换柱上，以咪唑鎓离子液体/酸为流动相进行Mg、Ca和Sr的色谱分离，其中咪唑鎓离子液体作为紫外吸收试剂。研究了咪唑鎓离子液体、检测波长、流动相中的酸以及柱温对Mg、Ca和Sr保留的影响。在间接紫外检测的离子色谱中，影响分离和检测的主要因素是背景紫外吸收试剂和氢离子浓度。使用选定的色谱条件，在14分钟内成功实现了Mg、Ca和Sr的分离和检测，检测限（S/N = 3）分别为0.06、0.12和0.23 mg/L。开发了一种通过离子色谱间接紫外检测法分离和检测碱土金属离子的新方法，扩大了离子液体的应用范围。
