INVESTIGADORES
SAVIO marianela
artículos
Título:
Study of carbon nanotubes and functionalized-carbon nanotubes as substrates for flow injection solid phase extraction associated to inductively coupled plasma with ultrasonic nebulization Application to Cd monitoring in solid environmental samples
Autor/es:
BELÉN PARODI; MARIANELA SAVIO; LUIS D. MARTINEZ; RAÚL A. GIL; PATRICIA SMICHOWSKI
Revista:
MICROCHEMICAL JOURNAL
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2011 vol. 98 p. 225 - 230
ISSN:
0026-265X
Resumen:
A research was performed to ascertain the performance and the potential of carbon nanotubes (CNT) and modified CNT as a sorbent for solid phase extraction, coupled to ICP OES with ultrasonic nebulization (USN) for the on-line preconcentration of trace Cd. The on-line solid phase extraction of the analyte on three different carbon nanotubes, e.g. carbon nanotubes (CNT), oxidized-carbon nanotubes (ox-CNT) and L-alanine-carbon nanotubes (ala-CNT) was studied systematically. Moreover, the main factors that influence the preconcentration and determination of Cd were examined thoroughly. The CNTs evaluated showed dissimilar adsorption behaviors that enabled increasing preconcentration factors when were used in this on-line SPE method set up as follows: CNT < ala-CNT < ox-CNT. Cd could be adsorbed quantitatively on ox-CNT at pH 7.0, and then eluted completely with 10% of HNO3. The adsorption capacity on ox-CNT was found to be 130 µmol g-1. Under the optimal conditions, the detection limit was (3S) was 1.03 µg l−1. The precision of the method expressed as the relative standard deviation (RSD) turned to be 0.3%. After optimization, the flow injection analysis that involved the use of ox-CNT as sorbent and USN-ICP OES, was successfully applied to the determination of Cd in water samples.