Determination of trace alkaline earth metals in brines using chelation ion chromatography with an iminodiacetic acid bonded silica column
Determination of trace alkaline earth metals in brines using chelation ion chromatography with an iminodiacetic acid bonded silica column
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DOI：
10.1016/s0021-9673(00)01027-x
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发表时间：
2001-01-12
影响因子：
4.1
通讯作者：
Paull, B
中科院分区：
文献类型：
--
作者：
Bashir, W;Paull, B
本文研究了碱土金属在亚氨基二乙酸键合硅胶上的色谱行为。有人发现，洗脱液的离子强度极大地影响保留时间和选择性通过控制的程度，无论是简单的离子交换或表面络合是负责保留。使用0.1 M KNO3洗脱液，保留顺序为Mg（II）、Sr（II）、Ca（II）和Ba（II），表明离子交换对保留有很大贡献。然而，当使用1.5 M KNO3洗脱液时，发现Ba（II）首先溶解，表明在这些条件下（pH 4.2）络合作用更占主导地位。还研究了样品的离子强度的影响，结果发现，通过匹配洗脱液的阳离子与样品基质，有效的分离碱土金属在1.0 M NaCl和KCl盐水可以得到没有基质系统的峰。采用邻甲酚酞络合剂柱后反应，测定了药用NaCl盐溶液和实验室级KCl中痕量Ca（II）和Mg（II）。(C)2001 Elsevier Science B.V.保留所有权利。
The chromatographic behaviour of alkaline earth metals on iminodiacetic acid bonded silica was studied. It was found that the ionic strength of the eluent greatly affected both retention time and selectivity by controlling the extent to which either simple ion exchange or surface complexation was responsible for retention. With a 0.1 M KNO3 eluent, the retention order was Mg(II), Sr(II), Ca(II) and Ba(II), indicating a strong contribution to retention from ion exchange. However, when using a 1.5 M KNO3 eluent, Ba(II) was found to elute first, indicating complexation to be more dominant under these conditions (pH 4.2). The effect of the ionic strength of the sample was also studied and it was found that by matching the eluent cation with that of the sample matrix, efficient separations of alkaline earth metals in 1.0 M NaCl and KCl brines could be obtained without matrix system peaks. Using post-column reaction with o-cresolphthalein complexone, trace levels of Ca(II) and Mg(II) were determined in medicinal NaCl saline solution and laboratory-grade KCl. (C) 2001 Elsevier Science B.V. All rights reserved.