INQUISAL   20936
INSTITUTO DE QUIMICA DE SAN LUIS "DR. ROBERTO ANTONIO OLSINA"
Unidad Ejecutora - UE
artículos
Título:
Antimony speciation analysis by hydride trapping on hybrid nanoparticles packed in a needle trap device with electro-thermal atomic absorption spectrometry determination
Autor/es:
MARATA, ARIEL; VILLAFAÑE GASTON; MARATA, ARIEL; VILLAFAÑE GASTON; BAZAN, VANESA; PABLO PACHECO; BAZAN, VANESA; PABLO PACHECO; BRIAN CARRIZO; LUIS DANTE MARTINEZ; BRIAN CARRIZO; LUIS DANTE MARTINEZ
Revista:
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
Editorial:
ROYAL SOC CHEMISTRY
Referencias:
Lugar: CAMBRIDGE; Año: 2018 vol. 33 p. 2195 - 2202
ISSN:
0267-9477
Resumen:
Oxidized multiwall carbon nanotubes (oxMWCNTs) were combined with TiO2 nanoparticles to obtainhybrid nanoparticles (HNPs). A miniaturized flow injection (FI) system was introduced for antimonyspeciation and a headspace vial was used for hydride generation. HNPs were introduced into a needletrap device (NTD) as a sorbent for antimony hydride preconcentration in gas phase trapping. Antimonyhydrides were adsorbed on HNPs. Electrothermal Atomic Absorption Spectrometry (ETAAS) was used fordetermination. The synergistic effect of HNPs improves Sb adsorption compared to oxMWCNTs reachingthe quantitative preconcentration of the analyte in 1 minute. However, NaBH4 concentration, HClconcentration and the elution volume were selected as variables for optimization. A Box?Behnkendesign indicated that the optimal response is achieved using 0.5% NaBH4 (m v1), 1.5 mol L1 HCl and40 mL volume of elution. After optimization a retention efficiency of 99.8% was achieved witha preconcentration factor of 100. The limits of detection (LOD) and quantification (LOQ) were 0.4 and1.2 ng L1. The relative standard deviation was 7.9% (n ¼ 10). The time of analysis was 14 minutes. Thedeveloped technique was successfully applied to the analysis of river water samples