Alumina–titania (Al₂O₃–TiO₂) hollow fiber sorptive microextraction coupled to inductively coupled plasma mass spectrometry for determination of trace elements in diesel and gasoline samples

Abstract

An alumina-titania (Al 2 O 3 -TiO 2 ) hollow fiber membrane was synthesized using the template method coupled with a sol-gel process. The crystal forms of the mixed oxides hollow fiber was evaluated using X-ray diffraction (XRD). The morphological structure and surface characteristics of the Al 2 O 3 -TiO 2 hollow fiber was characterized by scanning electron microscope (SEM) and nitrogen adsorption/desorption BET technique. The synthesized Al 2 O 3 -TiO 2 hollow fiber membrane was combined with inductively coupled plasma mass spectrometry for on-line preconcentration and determination of trace amounts of Co, Cr, Mo, Ni, Sb and V in diesel and gasoline samples. The optimization of the experimental parameters affecting the preconcentration and determination of target analytes was performed using a full 2 4 factorial and central composite designs. Under optimized conditions, limits of detection (LOD) (based on the original sample) and limits of quantification (LOQ) ranged 0.1-0.9 and 0.3-3.0 ng L -1 , respectively. The developed method was applied in the determination of trace elements in real diesel and gasoline samples.

Atomic spectrometry update: review of advances in the analysis of metals, chemicals and functional materials

“…Analysis of spiked samples produced recoveries for the listed elements between 90-107% by comparison with alternative methods. Nomngongo et al 35 described an on-line hollow bre membrane micro-extraction technique for the determination of Co, Cr, Mo, Ni, Sb and V in diesel and gasoline samples. An Al 2 O 3 -TiO 2 hollow bre membrane was synthesized and linked on-line to an ICP-MS instrument.…”