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Study of metal-loaded activated charcoals for the separation and determination of selenium species by energy dispersive X-ray fluorescence analysis
Authors:Sanna Latva  Sirpa Peräniemi  Markku Ahlgrén
Institution:Department of Chemistry, University of Joensuu, P.O. Box 111, FIN-80101 Joensuu, Finland
Abstract:Conversion of adsorption properties of activated charcoal (C) by metal modification towards selenite, selenate and seleno-dl-methionine (Se-Met) was studied. Several metals were included in modification studies and also a procedure was developed for the separation and independent determination of microgram quantities of these selenium species in aqueous solution. Selenium species were collected one by one from the same sample solution onto collector material by adsorbing them directly or after complex formation onto different metal-loaded activated charcoals (MgC and FeC). The mass of selenium in these collectors was measured directly by energy dispersive X-ray fluorescence spectrometry (EDXRF). Detection limits for all three selenium species were better than 6 μg corresponding to concentration of 60 μg/l with 0.100 l of initial sample volume.
Keywords:Selenium  Se(IV)  Se(VI)  dl-methionine" target="_blank">Seleno-dl-methionine  Preconcentration  Adsorption  Activated charcoal  Metal modification  Energy dispersive X-ray fluorescence spectrometry  Graphite furnace atomic absorption spectrometry
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