García-Fernández Ruben, García-Alonso J Ignacio, Sanz-Medel Alfredo
Department of Physical and Analytical Chemistry, University of Oviedo, C/Julián Clavería 8, 33006 Oviedo, Spain.
J Chromatogr A. 2004 Apr 9;1033(1):127-33. doi: 10.1016/j.chroma.2004.01.024.
Suppressed conductimetric detection ion chromatography (IC) was investigated for the separation and detection of common inorganic anions, calcium and magnesium by anion-exchange chromatography using a sodium carbonate-EDTA mobile phase. The formation of anionic Ca2+ -EDTA and Mg2+ -EDTA complexes allowed its separation from other inorganic anions opening the way for their simultaneous determination in a single chromatographic run. The effect of the pH, carbonate and EDTA concentrations in the eluent and the previous addition of EDTA to the samples has been studied. The optimised experimental conditions were applied to the determination of Ca2+ and Mg2+ in mineral waters with results in agreement with alternative ICP-MS methodologies.
研究了抑制型电导检测离子色谱法（IC），用于通过使用碳酸钠-乙二胺四乙酸（EDTA）流动相的阴离子交换色谱法分离和检测常见无机阴离子、钙和镁。阴离子Ca2+-EDTA和Mg2+-EDTA络合物的形成使其能够与其他无机阴离子分离，为在一次色谱运行中同时测定它们开辟了道路。研究了洗脱液中pH值、碳酸盐和EDTA浓度以及预先向样品中添加EDTA的影响。将优化的实验条件应用于矿泉水中Ca2+和Mg2+的测定，结果与替代的电感耦合等离子体质谱（ICP-MS）方法一致。
