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Demonstration of a novel ion-exchange column for pre-concentration of silver ions in optical emission spectroscopy utilizing a liquid-sampling atmospheric pressure glow discharge microplasma

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Abstract

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.

Graphical abstract: Demonstration of a novel ion-exchange column for pre-concentration of silver ions in optical emission spectroscopy utilizing a liquid-sampling atmospheric pressure glow discharge microplasma

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Publication details

The article was received on 07 Sep 2017, accepted on 19 Oct 2017 and first published on 30 Oct 2017


Article type: Technical Note
DOI: 10.1039/C7JA00310B
Citation: J. Anal. At. Spectrom., 2017, Advance Article
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    Demonstration of a novel ion-exchange column for pre-concentration of silver ions in optical emission spectroscopy utilizing a liquid-sampling atmospheric pressure glow discharge microplasma

    K. A. Hall, L. Jiang and R. K. Marcus, J. Anal. At. Spectrom., 2017, Advance Article , DOI: 10.1039/C7JA00310B

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