Journal
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
Volume 89, Issue 4, Pages 223-231Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/03067310802262656
Keywords
flame atomic absorption spectroscopy; clinoptilolite; solid phase extraction; 1-(2-pyridylazo)-2-naphthol; preconcentration
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Funding
- Yazd University
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A solid phase extraction system for separation and preconcentration of trace amounts of Pb(II), Ni(II), Cd(II) and Cu(II) is proposed. The procedure is based on the adsorption of Pb2+, Ni2+, Cd2+ and Cu2+ ions on a column of 1-(2-pyridylazo)-2-naphthol (PAN) immobilised on surfactant-coated clinoptilolite prior to their determinations by Flame Atomic Absorption Spectroscopy (FAAS). The effective parameters including pH, sample volume, sample flow rate and eluent flow rate were also studied. The analytes collected on the column were eluted with 5 mL of 1 mol L-1 nitric acid. A concentration factor of 180 can be achieved by passing 900 mL of sample through the column. The detection limits (3 s) for Cd, Cu, Pb and Ni were found to be 0.28, 0.12, 0.44 and 0.46 mu g L-1, respectively. The relative SDs at 10 mu g L-1 (n = 10) for analytes were in the range of 1.2-1.4%. The method was applied to the determination of Pb, Ni, Cd and Cu in water samples.
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