PERSONAL DE APOYO
CALDERON SEGOVIA Matias Francisco
artículos
Título:
Liquid-liquid microextraction based on a dispersion of Pd nanoparticles combined with ETAAS for sensitive Hg determination in water samples
Autor/es:
ESTEFANÍA M. MARTINIS; LETICIA B. ESCUDERO; ROBERTO SALVAREZZA; MATIAS F. CALDERÓN; FRANCISCO J. IBAÑEZ; RODOLFO G. WUILLOUD
Revista:
TALANTA
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2013 p. 46 - 52
ISSN:
0039-9140
Resumen:
A novel and highly efficient microextraction methodology based on the
use of palladium nanoparticles (Pd NPs) was developed for the
preconcentration and determination of Hg in water samples. Selective
separation of the analyte was achieved by application of
dodecanethiolate-coated Pd monolayer-protected clusters (C12S Pd MPCs)
in a liquidliquid microextraction technique (LLME). A volume of 20 μL
of toluene phase containing C12S Pd MPCs was used for extraction and
final phase was injected in an electrothermal atomic absorption
spectrometer (ETAAS) for Hg detection. The effects of different
variables, such as sample volume, extraction time, and NPs dispersion
volume were carefully studied. A sensitivity enchancement factor of 95
was obtained under optimal experimental conditions. Furthermore, low
detection limit (7.5 ng L−1) and good precision (relative standard deviation of 4.1% at 0.25 μg L−1 Hg and n=10)
were achieved. The proposed method can be considered as a rapid,
cost-effective, and efficient alternative for Hg determination in water
samples like river, lake, mineral and tap water.