Determination of selenium in garlic (Allium sativum) and onion (Allium cepa) by electro thermal atomic absorption spectrometry |
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Authors: | Belgin Izgi Seref Gucer Radojko Ja?imovi? |
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Affiliation: | 1. Uludag University, Science and Art Faculty, Department of Chemistry, Gorukle, 16059 Bursa, Turkey;2. Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia |
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Abstract: | A separation/enrichment procedure has been developed for the determination of selenium in garlic and onion samples by electrothermal atomic absorption spectrometry (ET-AAS) as a slurry sampling after preconcentration with 3,3-diaminobenzidine (DAB) reagent on the activated carbon. The influences of pH, time, amount of carbon and complexing reagent were outlined. The effect of acids used in the digestion of samples was also studied and compared. Selenium level was found to be 0.024 μg g−1 for onion (n = 5; LOD – 0.5 μg L−1; LOQ – 1.7 μg L−1) and 0.015 μg g−1 for garlic (n = 5; LOD – 1.3 μg L−1; LOQ – 3.3 μg L−1). Three different samples of garlic were analyzed by k0-instrumental neutron activation analysis (k0-INAA) at the Jozef Stefan Institute (JSI). The data obtained by k0-INAA show that the content of selenium overlapped the results obtained by ET-AAS. |
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Keywords: | Selenium determination ET-AAS k0-INAA Garlic Onion Slurry Activated carbon |
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