Selective Separation and Analysis of Pb(II) Using a New Surface Imprinted Multi-Walled Carbon
Nanotubes Combined with AAS
Copyright © 2012 SciRes. JASMI
Table 3. Comparisons of maximum adsorption capacity, analytical precision and accuracy of different SPE materials for
pre-concentration of Pb(II).
SPE material coupled with
The maximum adsorption
P2AT modified MWCNTs/AAS 186.4 1 3.2 
PANI modified MWCNTs/UV 22.2 ND ND 
Column SPE on MWCNTs/AAS ND* 8.0 <2.5 
IDA modified MWCNTs/ICP-MS 8.98 0.00070 1.0 
IMCNTs/AAS 115.5 0.47 1.16 Present work
*ND: not detected.
the range of 97.0% - 103.0%. The comparisons of maxi-
mum adsorption capacity, analytical precision and accu-
racy of different SPE materials for Pb(II) was given in
Tables 3. As could be seen, the present analytical
method was comparable with that obtained by other re-
ported different SPE materials in recent years. These
results clearly demonstrated that the IMCNTs prepared
were highly efficient, suitable and satisfactory for ex-
tracting and determining Pb(II) ions.
The newly IMCNTs was synthesized using a complex of
PDABMBAPOL with Pb(II) as functional monomer and
template ion. The IMCNTs exhibited high affinity, selec-
tivity and fast kinetics for Pb(II) ions. Under optimal
conditions, the maximum adsorption quantity of IMCNTs
was 115.5 mg·g−1 much higher than that of Non-
IMCNTs (84.4 mg·g−1). The presence of other metal ions
such as Cd(II), Cu(II), or Ni(II) did not affect IMCNTs
selectivity for Pb(II). Separation and pre-concentration
by solidphase extraction with IMCNTs particles results
in a limit of detection of 0.47 μg·L−1 (3σ) and RSD (n =
8) of 1.16% by using AAS. In addition, the IMCNTs
prepared had high reproducibility and were efficient,
sensitive and reliable for the enrichment and determina-
tion of trace lead.
This research was supported by the National Natural
Science Foundation of China (No. 11175080) and by the
Nature Science Fund of the Hunan Province (No.
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