UV-photochemical vapor generation of selenium for atomic absorption spectrometry: Optimization and 75Se radiotracer efficiency study
Autor: | Petr Rychlovský, Václav Červený, Marcela Rybínová, Miloslav Vobecký, Stanislav Musil |
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Rok vydání: | 2016 |
Předmět: |
Detection limit
Analyte Formic acid 010401 analytical chemistry Analytical chemistry chemistry.chemical_element 02 engineering and technology Repeatability 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Analytical Chemistry law.invention chemistry.chemical_compound chemistry Nitric acid law 0210 nano-technology Atomic absorption spectroscopy Instrumentation Quartz Spectroscopy Selenium |
Zdroj: | Spectrochimica Acta Part B: Atomic Spectroscopy. 123:134-142 |
ISSN: | 0584-8547 |
Popis: | Volatile selenium compounds were generated UV-photochemically in the continuous flow mode using four UV-photoreactors differing in the material of the reaction coil; Teflon tubing and quartz tubes with various inner diameters and wall thicknesses were tested. Atomic absorption spectrometry with an externally heated quartz furnace atomizer was employed as the detector. The relevant experimental generation parameters were optimized and the basic analytical characteristics were determined. Using formic acid as the photochemical agent, limits of detection achieved for selenium were in the range 46–102 ng L − 1 in dependence on the type of UV-photoreactor employed. When nitric acid was also added to the photochemical agent, the limits of detection were reduced to 27–44 ng L − 1 . The repeatability did not exceed 2.4% (5 μg L − 1 Se(IV), n = 10). Experiments with 75 Se radiotracer have been performed for the first time to quantify the efficiency of UV-photochemical vapor generation (UV-PVG) of selenium. The highest efficiency of 67 ± 1% was obtained for a UV-photoreactor containing a quartz reaction coil (2.0 mm i.d., 4.0 mm o.d.). The generation efficiency of 61 ± 1% was obtained for a Teflon reaction coil (1.0 mm i.d., 1.4 mm o.d.). Mapping of the radiotracer distribution in the individual parts of the apparatus did not reveal substantial transport losses of the analyte in the UV-PVG system. |
Databáze: | OpenAIRE |
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