Nebulization and analysis characteristics of a particle beam–hollow cathode glow discharge atomic emission spectrometry system
| Autor: | R. Kenneth Marcus, Patrick A. Depalma, Jianzhang You |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | J. Anal. At. Spectrom.. 11:483-490 |
| ISSN: | 1364-5544 0267-9477 |
| DOI: | 10.1039/ja9961100483 |
| Popis: | A detailed evaluation of the nebulization characteristics of a particle beam/hollow cathode glow discharge atomic emission spectrometry system is described. The optimization of sample introduction and particle beam interface operation was further evaluated for applications in elemental analysis for a number of transition metals. A high efficiency thermoconcentric nebulizer, coupled to a particle beam LC–MS interface, was employed to introduce analyte particles into a heated hollow cathode glow discharge source in either flow injection or continuous flow mode. The measurement of pressure and temperature in the desolvation chamber, along with the addition of a helium supplement gas, provides an insight into the sample/particle transport mechanism. The effects of capillary size (inner diameter) and solvent composition (methanol–water volume ratio) at various liquid flow rates were studied to evaluate optimum sample introduction conditions. Calibration graphs of Cu, Pb, Fe and Mg in the range 50 ppb–10 ppm show promising linearity under optimized conditions. The variability of multiple injections at a single concentration is less than 15% RSD over this concentration range. The limits of detection for Cu, Pb, Fe and Mg are 12, 25, 20 and 15 ppb, respectively, for 200 µl injection volumes. |
| Databáze: | OpenAIRE |
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