"Modifiers" - How do they work ? - A personal view

0162371 - UIACH-O 20020022 RIV BG eng C - Konferenční příspěvek (zahraniční konf.)
Dočekal, Bohumil
"Modifiers" - How do they work ? - A personal view.
5th European Furnace Symposium and 10th International Solid Sampling Colloquium with Atomic Spectroscopy. Programme and Book of Abstracts. Blagoevgrad: SouthWest University, 2002, s. 50.
[European Furnace Symposium /5./and International Solid Sampling Colloquium with Atomic Spectroscopy /10./. Blagoevgrad (BG), 01.09.2002-04.09.2002]
Výzkumný záměr: CEZ:AV0Z4031919
Klíčová slova: matrix modification * chemical modifiers * graphite furnace atomic absorption spectrometry
Kód oboru RIV: CB - Analytická chemie, separace

The effect of various chemical modifiers, including nitrates of palladium, nickel, magnesium, calcium, lanthanum, europium and aluminium, on the analytical signal of various selenium species (selenate, selenite, selenomethionine, trimethylselenonium iodide) in GFAAS is reported. A generalized strategy in chemical modification processes taking place in graphite furnace atomizers is recommended, especially for the analysis of biological fluids. Useful chemical modification involves the application of a considerable excess of some metal nitrates producing thermally stable oxides and no refractory carbides. At the same time, this modification should be capable of quantitative conversion of the analyte (isoformation) into a single form of selenium precursor that is quantitatively trapped by the modifier.
Trvalý link: http://hdl.handle.net/11104/0059689