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Application of multiwalled carbon nanotubes as solid phase extraction sorbent for preconcentration of trace copper in water samples

✍ Scribed by Pei Liang; Qiong Ding; Feng Song

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
95 KB
Volume
28
Category
Article
ISSN
1615-9306

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✦ Synopsis

Abstract

The adsorption behavior of multiwalled carbon nanotubes (MWNTs) toward copper has been investigated systemically, and a new method has been developed for the determination of trace copper in water samples based on preconcentration with a microcolumn packed with MWNTs prior to its determination by flame atomic absorption spectrometry. The optimum experimental parameters for preconcentration of copper, such as pH of the sample, sample flow rate and volume, elution solution and interfering ions, have been investigated. Copper can be quantitatively retained by MWNTs in the pH range 5–8, and then eluted completely with 0.5 M HNO~3~. The detection limit of this method for Cu was 0.42 ng/mL, and the RSD was 3.5% at the 10 ng/mL Cu level. The method was validated using a certified reference material, and has been successfully applied for the determination of trace copper in water samples.

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