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International Journal of Environmental Analytical Chemistry Volume 89, 2009 - Issue 8-12: Proceedings of the 35th International Symposium of Environmental Analytical Chemistry, Gdansk, Poland, 22–26 June 2008
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Original Articles

Preconcentration of trace cadmium and manganese using 1-(2-pyridylazo)-2-naphthol-modified TiO2 nanoparticles and their determination by flame atomic absorption spectrometry

Jamshid L. Manzoori Faculty of Chemistry, Department of Analytical Chemistry, University of Tabriz, Tabriz, IranCorrespondence[email protected]
,
Mohammad Amjadi Faculty of Chemistry, Department of Analytical Chemistry, University of Tabriz, Tabriz, Iran
&
Tooba Hallaj Faculty of Chemistry, Department of Analytical Chemistry, University of Tabriz, Tabriz, Iran
Pages 749-758 | Received 27 Jul 2008, Accepted 09 Jan 2009, Published online: 22 Sep 2010
 
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Abstract

A new method has been developed for the preconcentration of trace amounts of manganese and cadmium prior to their determination by flame atomic absorption spectrometry (FAAS). The method is based on using a microcolumn packed with 1-(2-pyridylazo)-2-naphthol (PAN)-modified sodium dodecyl sulfate (SDS) coated TiO2 nanoparticles as a solid-phase sorbent. Effects of pH, sample flow rate and volume, elution solution and interfering ions on the recovery of the analytes have been investigated. The adsorption capacity of modified TiO2 nanoparticles was found to be 9.2 and 8.9 mg g−1 for Mn and Cd, respectively. The detection limits (3σ) of this method are 1.0 and 0.96 ng mL−1 for Mn and Cd, respectively. The proposed method has been applied to the determination of the elements in water samples with satisfactory results.

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