INQUISAL   20936
INSTITUTO DE QUIMICA DE SAN LUIS "DR. ROBERTO ANTONIO OLSINA"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
On-Line Preconcentration of Zinc on Ethyl Vinyl Acetate prior to its Determination by Vapor Generation Associated to Inductively Coupled Plasma Optical Emission Spectrometry
Autor/es:
L.A. ESCUDERO, S. CERUTTI, J.A. SALONIA, L.D. MARTINEZ, J.A. GASQUEZ
Lugar:
Mar del Plata
Reunión:
Simposio; Eleventh Rio Symposium on Atomic Spectrometry; 2010
Resumen:
The use of hydride
generation techniques has expanded in scope to encompass the generation of unconventional volatile species (possibly
as hydrides, vapors, or other unidentified species) of different noble and
transition metals and noble metals and noticeable efforts have been dedicated
to clarification of mechanistic aspects [1, 2]. Attention has been paid to the development of vapor generation of zinc because this element plays an important role
in environment and human health [3, 4]. In the present work, for first time, an
on-line preconcentration procedure has been coupled to zinc vapor generation. The variables
involving the preconcentration and the vapor generation were optimized using
full factorial designs, respectively. Trace amounts of
zinc were preconcentrated by sorption on a minicolumn packed with ethyl vinyl
acetate. The analyte retained was removed from the minicolumn with hydrochloric
acid. After that, volatile species of zinc were generated by merging the
acidified eluent 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. An enhancement factor of 58-fold for a
sample volume of 25 ml was obtained. The detection limit achieved was 0.06 mg L-1.The
proposed method was successfully applied to the determination of traces of Zn in a CRM and water samples.