Microchimica Acta

, Volume 181, Issue 9–10, pp 1035–1040 | Cite as

Preconcentration of trace lead via formation of the bis(2,2-bipyridyl) complex and its adsorption on oxidized multiwalled carbon nanotubes

Original Paper

Abstract

A solid phase extraction method is presented for the preconcentration of trace lead ions on oxidized multiwalled carbon nanotubes (ox-MWCNTs). In the first step, the cationic Pb(II) complex of 2,2-bipyridyl is formed which, in a second step, is adsorbed on ox-MWCNTs mainly due to electrostatic and van der Waals interactions. The Pb(II) ions were then eluted with dilute nitric acid and quantified by FAAS. The effects of pH value, mass of sorbent, concentration of 2,2-bipyridyl, stirring time, of type, concentration and volume of eluent, of eluent flow rate and sample volume were examined. Most other ions do not affect the recovery of Pb(II). The limits of detection are 240 and 60 ng L−1 for sample volumes of 100 and 400 mL, respectively. The recovery and relative standard deviation are >95 % and 2.4 %, respectively. Other figures of merit include a preconcentration factor of 160 and a maximum adsorption capacity of 165 mg g−1. The method was successfully applied to the determination of Pb(II) in spiked tap water samples. The accuracy of the method was verified by correctly analyzing a certified reference material (NCS ZC85006; lead in tomatoes).

Figure

A solid phase extraction method is presented for the preconcentration of trace lead ions on oxidized multiwalled carbon nanotubes (ox-MWCNTs). Most other ions do not affect the recovery of Pb(II).

Keywords

Multiwalled carbon nanotubes 2,2-bipyridyl Flame atomic absorption spectrometry Trace amounts of lead Selectivity 

Supplementary material

604_2014_1210_MOESM1_ESM.pdf (265 kb)
ESM 1 (PDF 265 kb)

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Copyright information

© Springer-Verlag Wien 2014

Authors and Affiliations

  1. 1.Department of Analytical Chemistry, Institute of ChemistryUniversity of SilesiaKatowicePoland

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