Sensitive Determination of Cd in Small-Volume Samples by Miniaturized Liquid Drop Anode Atmospheric Pressure Glow Discharge Optical Emission Spectrometry
| Autor: | Krzysztof Swiderski, Anna Dzimitrowicz, Piotr Jamroz, Pawel Pohl, Krzysztof Greda |
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| Rok vydání: | 2017 |
| Předmět: |
Detection limit
Glow discharge Atmospheric pressure Chemistry 010401 analytical chemistry Direct current Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Cathode 0104 chemical sciences Analytical Chemistry Anode law.invention Ion law Graphite 0210 nano-technology |
| Zdroj: | Analytical Chemistry. 89:5729-5733 |
| ISSN: | 1520-6882 0003-2700 |
| DOI: | 10.1021/acs.analchem.7b01198 |
| Popis: | A novel liquid drop anode (LDA) direct current atmospheric pressure glow discharge (dc-APGD) system was applied for direct determination of Cd in liquid microsamples (50 μL) by optical emission spectrometry (OES). The microdischarge was generated in open-to-air atmosphere between a solid pin type tungsten cathode and a liquid drop placed on a graphite disk anode. The arrangement of the graphite disk placed on a PTFE chip platform as well as the solid pin type cathode was simple and robust. The limit of detection (LOD) of Cd for the developed LDA-APGD-OES method was 0.20–0.40 μg L–1, while precision (as the relative standard deviation for the repeated measurements) was within 2–5%. By using the liquid drop of 50 μL, the linearity range of 1–1000 μg L–1 was achieved. The effect of addition of the low-molecular weight (LMW) organic compounds, easily ionized elements (EIEs), i.e., Ca, K, Mg, and Na, as well as the foreign ions (Al, Cu, Fe, Mn, Zn) to the solution on the in situ atomization and excitation proc... |
| Databáze: | OpenAIRE |
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