NDLI: On-line flow injection solid phase extraction using oxidised carbon nanotubes as the substrate for cold vapour-atomic absorption determination of Hg(ii) in different kinds of water

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On-line flow injection solid phase extraction using oxidised carbon nanotubes as the substrate for cold vapour-atomic absorption determination of Hg(ii) in different kinds of water

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Journal of Analytical Atomic Spectrometry Vol - 29 Issue - 4

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On-line flow injection solid phase extraction using oxidised carbon nanotubes as the substrate for cold vapour-atomic absorption determination of Hg(ii) in different kinds of water

Content Provider	Royal Society of Chemistry (RSC)
Author	Parodi, Belén Londonio, Agustín Smichowski, Patricia Polla, Griselda Savio, Marianela
Copyright Year	2014
Abstract	A study was carried out to investigate the concentrations of Hg(II) in different categories of water samples at ng L−1 levels. The capabilities of oxidised carbon nanotubes (ox-CNTs) were studied to assess if this substrate serves as an efficient material for Hg(II) preconcentration using an on-line flow injection cold vapour-atomic absorption spectrometry (FI-CV-AAS) system. Carbon nanotubes are characterized by a marked tendency to aggregate, which negatively affects the retention of Hg whenever integrated in flow systems as a packed column. For this reason, the preconcentration was carried out in a microcolumn filled with a mixture of ox-CNTs and a low molecular weight polyethylene. The preparation of the microcolumn was studied in detail. Concerning column design, the best performance was achieved when packing the substrate in a microcolumn of 2.25 mm (i.d.) × 20 mm length. The effect of chemical and physical parameters including the pH of the solutions, the eluent type and the concentration was systematically examined. Mercury was retained at pH 5.0 and 15% (v/v) HCl was the best alternative for Hg(II) elution. Under optimal conditions, the adsorption capacity of the substrate was found to be 3.2 mg g−1 reaching a preconcentration factor (PF) of 150. The high adsorption capacity of this substrate allowed reaching a detection limit (3σ) of 1.9 ng L−1, when using a sorbent column containing only 1.0 mg of ox-CNTs. The limit of quantification (10σ) resulted to be 6.3 ng L−1. Precision, expressed as relative standard deviation (RSD), turned out to be 1.6% at the 0.1 μg L−1 level (n = 8). The system was evaluated for quantitative determination of Hg in river water, sea water and effluents.
Starting Page	880
Ending Page	885
Page Count	6
File Format	HTM / HTML PDF
ISSN	02679477
Volume Number	29
Issue Number	5
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/c3ja50396h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Carbon nanotube Absorption spectroscopy Polyethylene PH Elution Phoenix Mercury Hydrochloric acid Adsorption Coefficient of variation
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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