Arsenic and antimony in water and wastewater: overview of removal techniques with special reference to latest advances in adsorption

Carbon nanotubes applications in separation science: a review

Application of nanomaterials in sample preparation

Carbon nanotubes as solid-phase extraction sorbents prior to atomic spectrometric determination of metal species: a review.

Multiwalled carbon nanotubes were impregnated with 4-(2-thiazolylazo)resorcinol and used for the separation and preconcentration of Cd(II), Pb(II), Zn(II) and Ni(II) ions from food samples. The analytes were quantitatively recovered at pH 7.0 and eluted with 3 mol L−1 acetic acid. The effects of pH value, flow rate, eluent type and sample volume on the recoveries, and the effects of alkali, earth alkali and transition metals on the retention of the analytes were studied. The method was validated using the standard certified reference materials SRM 1570A (spinach leaves) and IAEA 336 (lichen), and the results were found to be compatible with the certified values of reference materials. The new enrichment procedure was applied to the determination of these ions in various food samples.

Solid phase extraction of Cd(II), Pb(II), Zn(II) and Ni(II) from food samples using multiwalled carbon nanotubes impregnated with 4-(2-thiazolylazo)resorcinol

Simultaneous speciation of inorganic arsenic and antimony in water samples by hydride generation-double channel atomic fluorescence spectrometry with on-line solid-phase extraction using single-walled carbon nanotubes micro-column

A simple and sensitive flow injection on-line sorption system using a multi-walled carbon nanotube (MWCNT)-packed micro-column was developed for the determination of bismuth by hydride generation atomic fluorescence spectrometry (HG-AFS). The procedure involved the sorption of bismuth on the MWCNTs via on-line introduction of the sample into the micro-column system, on-line elution of the adsorbed analyte with 10% (v/v) HCl, and merging with KBH 4 solution for HG-AFS detection. The ease of construction of the MWCNT-packed micro-column and the simplicity of the manifold without additional lines for chelating agents facilitated the development of a simple sorption procedure. With a 120-second sorption time, the limit of detection was 0.8 ng L -1 and the precision (RSD) for 11 replicate measurements of 0.1 μg L -1 Bi(III) was 4.6%. The developed method was validated by analyzing three certified reference materials and was successfully applied to the deter- mination of bismuth in environmental water samples.

Multi-walled Carbon Nanotube-Packed Micro-column for On-line Sorption and Determination of Bismuth in Environmental Water Samples by Hydride Generation Atomic Fluorescence Spectrometry

Jusheng Lu

Papers

Simultaneous speciation of inorganic arsenic and antimony in water samples by hydride generation-double channel atomic fluorescence spectrometry with on-line solid-phase extraction using single-walled carbon nanotubes micro-column

Multi-walled Carbon Nanotube-Packed Micro-column for On-line Sorption and Determination of Bismuth in Environmental Water Samples by Hydride Generation Atomic Fluorescence Spectrometry