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Determination of Chromium in Chloride-containing matrix using Zeeman ET AAS

Autoři: Dvorský Milan | Černohorský Tomáš | Krejčová Anna

Rok: 2004

Druh publikace: článek ve sborníku

Název zdroje: Book of Abstract - XVIIth Slovak Spectroscopis Conference, 5.-9.9.2004, Tatranské Zruby

Název nakladatele: Technická univerzita v Košiciach

Místo vydání: Košice

Strana od-do: 59

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Stanovení chromu v prostředí obsahující chloridy použitím Zeeman ET AAS	Stanovení chromu v prostředí obsahující chloridy použitím Zeeman ET AAS	ET AAS, Zeeman background correction, variable magnetic field, modifiers, chromium
eng	Determination of Chromium in Chloride-containing matrix using Zeeman ET AAS	Chromium was determined in chloride matrix by the electrothermal atomic absorption spectrometry (ET AAS) using transversally heated graphite atomizer (THGA) and Zeeman effect background correction. The optimisation of temperature program was performed with chromium solution contained 0,5 % (w/v) NaCl and 10 % (v/v) HNO3, which is typical matrix of digested instant soups and supplements. The effect of concentration and type of modifier (ascorbic acid, NH4NO3, Li, NH4H2PO4, Pd, Rh and V) on the behaviour of chromium was tested. For each modifier used, a magnetic field strength was also optimised and strong dependence was observed for Pd and especially Rh modifier. A high efficiency of thermal stabilization and excellent sensitivity with Pd and Rh modifier were obtained even thought relatively low concentration of modifiers were used (125 mg.l-1 Pd and 62.5 mg.l-1 of Rh). The characteristic mass was evaluated for NH4NO3 1,7 pg, V 1,7 pg, Pd 1,0 pg and even Rh 0,9 pg. The methods were recommended for the determination of chromium in digested samples containing high concentration chloride matrix e.g. instant soups and supplements.	ET AAS, Zeeman background correction, variable magnetic field, modifiers, chromium

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