Issue 16, 2013

Magnetic solid-phase extraction to preconcentrate ultra trace amounts of lead(ii) using modified-carbon nanotubes decorated with NiFe2O4 magnetic nanoparticles

Abstract

Here, multiwalled carbon nanotubes decorated with NiFe2O4 nanoparticles were synthesized by a simple reaction. Then, the nanoparticles were modified with 3-(trimethoxysilyl)-1-propanthiol. The modified-multiwalled carbon nanotubes decorated with NiFe2O4 nanoparticles were applied as a solid-phase extraction (SPE) sorbent for the extraction of ultra trace amounts of Pb(II) from water samples. Detection in this technique was performed by flame atomic absorption spectrometry. The influences of effective parameters on the extraction efficiency were studied. The best results were obtained at pH 6.0 (acetate–borate buffer) with 2.0 mL eluent solution of 1.5 mol L−1 nitric acid and an extraction time of 30 min. The detection limit was 0.5 ng mL−1 Pb(II) with a precision of 2.3–4.1%. The effects of matrix ions present in natural waters and some transition metals on the recoveries of the analyte ions were also examined in model solutions. Finally, the proposed method was used for the measurement of Pb(II) in water from the Shiraz Khoshk river (Shiraz, Iran), food, and industrial waste water from Isfahan's Mobarakeh Steel Company.

Graphical abstract: Magnetic solid-phase extraction to preconcentrate ultra trace amounts of lead(ii) using modified-carbon nanotubes decorated with NiFe2O4 magnetic nanoparticles

Article information

Article type
Paper
Submitted
10 Feb 2013
Accepted
13 May 2013
First published
13 May 2013

Anal. Methods, 2013,5, 3903-3908

Magnetic solid-phase extraction to preconcentrate ultra trace amounts of lead(II) using modified-carbon nanotubes decorated with NiFe2O4 magnetic nanoparticles

A. A. Ensafi, S. Rabiei, B. Rezaei and A. R. Allafchian, Anal. Methods, 2013, 5, 3903 DOI: 10.1039/C3AY40246K

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