Ding M Y, Tanaka K, Hu W, Hasebe K, Haddad P R
Department of Chemistry, Tsinghua University, Beijing 100084, China.
Analyst. 2001 May;126(5):567-70. doi: 10.1039/b100104n.
A non-suppressed conductivity detection ion chromatographic method using a weakly acidic cation-exchange column (Tosoh TSKgel OApak-A) was developed for the simultaneous separation and determination of common inorganic anions (Cl-, NO3- and SO4(2-)) and cations (Na+, NH4+, K+, Mg2+ and Ca2+). A satisfactory separation of these anions and cations on the weakly acidic cation-exchange column was achieved in 25 min by elution with a mixture of 1.6 mmol L-1 pyridine-2,6-dicarboxylic acid and 8.0 mmol L-1 18-crown-6 at flow rate of 1.0 mL min-1. On this weakly acidic cation-exchange resin, anions were retained by an ion-exclusion mechanism and cations by a cation-exchange mechanism. The linear range of the peak area calibration curves for all analytes were up to two orders of magnitude. The detection limits calculated at S/N = 3 ranged from 0.25 to 1.9 mumol L-1 for anions and cations. The ion-exclusion chromatography-cation-exchange chromatography method developed in this work was successfully applied to the simultaneous determination of major inorganic anions and cations in rainwater, tap water and snow water samples.
建立了一种使用弱酸性阳离子交换柱（Tosoh TSKgel OApak - A）的非抑制电导检测离子色谱法，用于同时分离和测定常见无机阴离子（Cl⁻、NO₃⁻和SO₄²⁻）和阳离子（Na⁺、NH₄⁺、K⁺、Mg²⁺和Ca²⁺）。通过以1.0 mL min⁻¹的流速用1.6 mmol L⁻¹吡啶 - 2,6 - 二羧酸和8.0 mmol L⁻¹ 18 - 冠 - 6的混合物洗脱，在25分钟内实现了这些阴离子和阳离子在弱酸性阳离子交换柱上的满意分离。在这种弱酸性阳离子交换树脂上，阴离子通过离子排斥机制保留，阳离子通过阳离子交换机制保留。所有分析物的峰面积校准曲线的线性范围高达两个数量级。在S/N = 3时计算的检测限对于阴离子和阳离子为0.25至1.9 μmol L⁻¹。本文建立的离子排斥色谱 - 阳离子交换色谱法成功应用于雨水、自来水和雪水样品中主要无机阴离子和阳离子的同时测定。
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