Antimony speciation analysis by hydride trapping on hybrid nanoparticles packed in a needle trap device with electro-thermal atomic absorption spectrometry determination

MARATA, ARIEL; BRIAN CARRIZO; BAZAN, VANESA; VILLAFAÑE GASTON; LUIS DANTE MARTINEZ; PABLO PACHECO

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY

ROYAL SOC CHEMISTRY

Lugar: CAMBRIDGE; Año: 2018

0267-9477

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