Solid phase extraction of lead (II), copper (II), cadmium (II) and nickel (II) using gallic acid-modified silica gel prior to determination by flame atomic absorption spectrometry

The immobilization of gallic acid on the surface of amino group-containing silica gel phases for the formation of a newly chelating matrix (GASG) is described. The newly synthesized extractant, characterized by the diffuse reflectance infrared Fourier transformation spectroscopy and elemental analys...

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Bibliographic Details
Published in:Talanta (Oxford) Vol. 74; no. 4; pp. 836 - 843
Main Authors: Xie, Fazhi, Lin, Xucong, Wu, Xiaoping, Xie, Zenghong
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 15.01.2008
Oxford Elsevier
Subjects:
Absorption
Analytical chemistry
Cations
Chemistry
Copper
electrolytes
Exact sciences and technology
Flow rates
Heavy metal
Lead
metal ions
Metals
Nickel
Q1
Silica gel modified with gallic acid (GASG)
Solid phase extraction
Sorption
Spectrometric and optical methods
Spectroscopy
Water sampling
Silica gel modified with gallic acid (GASG)
Solid phase extraction
Heavy metal
Elementary analysis
Copper II
Fourier transform spectroscopy
Nickel II
Immobilization
Metal ion
Chemical enrichment
Hydrochloric acid
Sample preparation
Cadmium II
Detection limit
Ion extraction
Silica gel
Stability
Gallic acid
Diffuse reflection
Flame spectrometry
Sorption
Infrared spectrometry
Lead II
Cations
River water
Atomic absorption spectrometry
ISSN:0039-9140, 1873-3573, 1873-3573
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Summary:The immobilization of gallic acid on the surface of amino group-containing silica gel phases for the formation of a newly chelating matrix (GASG) is described. The newly synthesized extractant, characterized by the diffuse reflectance infrared Fourier transformation spectroscopy and elemental analysis, was used to preconcentrate Pb(II), Cu(II), Cd(II) and Ni(II). The pH ranges for quantitative sorption and the concentrations of HCl for eluting Pb(II), Cd(II), Cu(II) and Ni(II) were opimized, respectively. The sorption capacity of the matrix has been found to be 12.63, 6.09, 15.38, 4.62 mg/g for Pb(II), Cd(II), Cu(II) and Ni(II), respectively, with the preconcentration factor of ∼200 (∼100 for Cd(II)). The effects of flow rates, the eluants, the electrolytes and cations on the metal ions extraction, as well as the chelating matrix stability and reusability, were also studied. The extraction behavior of the matrix was conformed with Langmuir's equation. The present preconcentration and determination method was successfully applied to the analysis of synthetic metal mixture solution and river water samples. The 3 σ detection limit and 10 σ quantification limit for Pb(II), Cu(II), Cd(II) and Ni(II) were found to be 0.58, 0.86, 0.65, 0.92 μg/L and 1.08, 1.23, 0.87, 1.26 μg/L, respectively.
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ISSN:0039-9140
1873-3573
1873-3573
DOI:10.1016/j.talanta.2007.07.018