A novel, small-volume, strong cation-exchange column has been employed as an on-line pre-concentrator for samples introduced to the liquid sampling-atmospheric pressure glow discharge (LS-APGD) microplasma. The column stationary phase was synthesized by a unique microwave-assisted grafting of sulfonic acid groups onto nylon 6 capillary-channeled polymer (C-CP) fibers. The column material is robust with respect to attack in acidic sample media, with high permeability that obviates the need to use a high-pressure liquid chromatography pump. The column-loading flow rate, sample-load volume, and sample concentration were studied to demonstrate the utility of the column in improving the limits of detection (LOD) of silver in nitrate/nitric acid solutions. The eluted analyte signal intensity was found to be unaffected by column-loading flow rates from 100 to 800 μL min⁻¹. When signal intensity was plotted against increasing sample-loading volumes and load concentrations, good linearity was observed (R² = 0.9939 and 0.9999). Overall, implementation of this novel column provides enhanced analytical performance for the LS-APGD-OES source with very minimal added experimental complexity. This is a key aspect as the microplasma is implemented on field-deployable platforms. It is imagined that the same fiber format could be easily adapted to larger size scales such as common to inductively-coupled plasma sources.

中文翻译：

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演示了使用液体采样大气压辉光放电微等离子体在光发射光谱法中对银离子进行预浓缩的新型离子交换柱

一种新颖的小体积，强阳离子交换柱已经用作在线预浓缩器，用于引入液体采样-大气压辉光放电（LS-APGD）微等离子体的样品。色谱柱固定相是通过独特的微波辅助将磺酸基团接枝到尼龙6毛细管通道聚合物（C-CP）纤维上而合成的。色谱柱材料对于在酸性样品介质中的侵蚀具有抵抗力，并且具有高渗透性，从而避免了使用高压液相色谱泵的需要。对色谱柱上样流速，样品上样量和样品浓度进行了研究，以证明该色谱柱在提高硝酸盐/硝酸溶液中银的检出限（LOD）方面的实用性。^-1。当将信号强度与增加的样品上样量和上样浓度作图时，观察到良好的线性（ R ² = 0.9939和0.9999）。总体而言，该新型色谱柱的实施为LS-APGD-OES离子源提供了增强的分析性能，同时增加了非常少的实验复杂性。这是一个关键方面，因为微等离子体是在可现场部署的平台上实现的。可以想象到，相同的光纤规格可以轻松地适应较大尺寸的尺寸，例如感应耦合等离子体源所共有的尺寸。