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Titolo:
MECHANISM FOR IMPROVING THE SENSITIVITY AND STABILITY OF SELENIUM IN THE PRESENCE OF RHODIUM-MAGNESIUM MIXED MODIFIER BY USING GRAPHITE-FURNACE AAS
Autore:
DONG XN; NAKAGUCHI Y; HIRAKI K;
Indirizzi:
KINKI UNIV,FAC SCI & TECHNOL,DEPT CHEM,3-4-1 KOWAKAE HIGASHIOSAKA OSAKA 577 JAPAN
Titolo Testata:
Bunseki Kagaku
fascicolo: 10, volume: 46, anno: 1997,
pagine: 785 - 790
SICI:
0525-1931(1997)46:10<785:MFITSA>2.0.ZU;2-B
Fonte:
ISI
Lingua:
JPN
Soggetto:
ATOMIC-ABSORPTION SPECTROMETRY; CHEMICAL MODIFICATION; SPECIATION;
Keywords:
SELENIUM; RHODIUM-MAGNESIUM MATRIX MODIFIER; GRAPHITE FURNACE AAS; HUMAN HAIR; ASHING AND ATOMIZATION MECHANISM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
15
Recensione:
Indirizzi per estratti:
Citazione:
X.N. Dong et al., "MECHANISM FOR IMPROVING THE SENSITIVITY AND STABILITY OF SELENIUM IN THE PRESENCE OF RHODIUM-MAGNESIUM MIXED MODIFIER BY USING GRAPHITE-FURNACE AAS", Bunseki Kagaku, 46(10), 1997, pp. 785-790

Abstract

A new mixed chemical modifier, rhodium nitrate-magnesium nitrate (RhNO3-MgNO3), has been applied to the determination of trace amounts of selenium in human hair samples by using graphite furnace AAS. The use of combined modifier allows a compromise of higher pyrolysis temperature in the detection of selenium. The ashing and atomization temperatures for selenium are 1000 degrees C and 2600 degrees C, respectively. A study of the mechanism found that this mixed modifier combined with selenium to form a new material, a Rh-Mg-Se alloy, on the surface of thefurnace during the ashing stage. The addition of modifier, as a selenium retainer, considerably improved the selenium sensitivity and stability of the method. The selenium level in a certified reference material, ''NIES No. 5 Hair'', and a mixed human hair sample were determinedby using the method. The obtained analytical result was in good agreement with the certified value. The relative standard deviation (RSD%) for selenium was within 7%. The detection limit (3 sigma) of the method was 0.08 ng Se for 10 mu l injection sample.

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Documento generato il 30/09/20 alle ore 09:40:25