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Application of multiwalled carbon nanotubes as solid phase extraction sorbent for preconcentration of trace copper in water samples
Author(s) -
Liang Pei,
Ding Qiong,
Song Feng
Publication year - 2005
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200500154
Subject(s) - detection limit , copper , certified reference materials , elution , solid phase extraction , sorbent , adsorption , chemistry , extraction (chemistry) , trace amounts , chromatography , analytical chemistry (journal) , materials science , medicine , alternative medicine , organic chemistry , pathology
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.