Journal
ANALYTICA CHIMICA ACTA
Volume 755, Issue -, Pages 54-61Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2012.10.021
Keywords
Carbon nanotubes; NH3-plasma treatment; Surface modification; Adsorption and electrochemical detection; Metal ions
Categories
Funding
- National Natural Science Foundation of China [21105073, 61102013, 21073197, 90923033]
- National Basic Research Program of China [2011CB933700]
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences [KF2011-18]
- One Hundred Person Project of the Chinese Academy of Sciences, China
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NH3-plasma treated multi-walled carbon nanotubes (pn-MWCNTs) with cation traps for the detection of ultratrace quantities of Zn(II), Cd(II), Cu(II), and Hg(II) using square wave anodic stripping voltammetry (SWASV) is described. The pn-MWCNTs use their adsorption performance to enhance the sensitivity. It is found that under optimized conditions Zn(II), Cd(II), Cu(II) and Hg(II) were individually detected at potentials of -1.16, -0.78, -0.268 and 0.108 V, respectively. The detection limit (3 sigma-method) of 0.314, 0.0272, 0.2263, and 0.1439 nM toward Zn(II), Cd(II), Cu(II), and Hg(II) is achievable, respectively. No interference could be seen during the simultaneous detection of Zn(II), Cd(II), Cu(II), and Hg(II). The pn-MWCNTs exhibit excellent selectivity owing to the different ability of adsorption. A study of the ability of pn-MWCNTs in practical application is carried out using a sample of water collected from Dongpu Reservoir in Hefei City, Anhui, China. It is found that the results were favorable when compared against inductively coupled plasma atomic emission spectrometry (ICP-AES) analysis. (C) 2012 Elsevier B.V. All rights reserved.
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