INVESTIGADORES
CERUTTI Estela soledad
artículos
Título:
On-line preconcentration and vapor generation of Scandium prior to ICP-OES detection
Autor/es:
S. CERUTTI, L.A. ESCUDERO, J.A. GASQUEZ, R.A. OLSINA, L.D. MARTINEZ
Revista:
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
Editorial:
ROYAL SOC CHEMISTRY
Referencias:
Lugar: CAMBRIDGE; Año: 2011 vol. 26 p. 2428 - 2433
ISSN:
0267-9477
Resumen:
A novel on-line scandium preconcentration
system implemented with chemical vapor generation associated to inductively
coupled plasma optical emission spectrometry (VG-ICP-OES) was studied. The
variables involving the preconcentration and the vapor generation were
optimized using both full factorial and central composite designs,
respectively. Trace amounts of scandium were preconcentrated by sorption on a
minicolumn packed with activated carbon (AC) at pH 7.0. The analyte retained
was removed from the minicolumn with 10% (v/v) hydrochloric acid. After that,
volatile species of scandium were generated by merging the acidified sample and
sodium tetrahydroborate(III) in a continuous flow system. The gaseous analyte was subsequently
introduced via a stream of Ar carrier into the inlet tube of the
inductively coupled plasma torch. For the preconcentration/vapor generation
procedure, an enhancement factor of 240-fold (10 for VG with respect to the
traditional pneumatic nebulization and 24 for preconcentration) for a sample
volume of 25 ml was obtained. The detection limit (DL) obtained was 4.0 μg l−1. The precision (RSD) for ten
replicate determinations at a level of 100 μg l−1 was 4.0%. Potential interfering
effects on the Sc signal were examined. The methodology was applied to the
determination of scandium in river water samples.