Third Day Poster Session, 17 June 2010 - NanoTR-VI

P
P Department
NanoscienceT
P
Poster Session, Thursday, June 17
Theme F686 - N1123
2+
Selective Solid Phase Extraction of PbP
P in Environmental Samples on Multiwalled Carbon Nanotubes
1
2
1
UHossein TavallaliUP P*, Mohammad ali KarimiP P, Hossein AsvadP
2
of Chemistry &T
1
PDepartment of Chemistry of Payame noor university, Shiraz, IRAN
and TNanotechnology Research LaboratoryT (NNRL), Payame Noor University (PNU),
Sirjan 78185-347, Iran
Abstract- Multiwalled carbon nanotubes (MWNTs) were used as solid phase extractor for Pb(II), ion as dithizone (DZ) chelates, in the present
study. The influences of the experimental parameters including pH of the solutions, amounts of MWNTs, amounts of DZ, eluent type and
volume, sample volume etc. on the quantitative recoveries of analyte ion were investigated. The presented method has been applied to the
determination of analytes in food and environmental samples with satisfactory results.
Trace metal analysis is an important part of studies in
analytical chemistry. In order to prevent the interference effect
of matrix and to determine the low levels of trace metal ions in
the real samples by flame atomic absorption spectrometry
usually requires an efficient preconcentration step in order to
bring the concentration of the analyte within the dynamic
measuring range of the detection limit. The separation
enrichment techniques have been used to improve the
sensitivity and selectivity of the trace analysis of the metal
ions. Few methods including cloud point extraction [1–3]
solvent extraction [4], co precipitation [5,6] membrane
filtration [7], etc have been reviewed for the enrichment of
heavy metal ions in-off line or on-line performance.
Nowadays, in the solid phase extraction studies transition
metals at trace level, investigation of the usage of new
materials as solid phase extractor is an important ratio. At this
point, carbon nanotubes (CNTs) have been proposed as a
novel solid phase extractor for various inorganic and organic
materials at trace levels [8–11]. CNTs are one of the most
commonly used building blocks of nanotechnology.
CNTs are one of the most commonly used building blocks of
nanotechnology. CNTs can be visualized as a sheet of graphite
that has been rolled into a tube, and divided into multiwalled
carbon nanotubes (MWNTs) and single-walled carbon
nanotubes (SWNTs) according to the carbon atom layers in
the wall of the nanotubes [12]. Liang et al. have proposed a
preconcentration system based on the adsorption of copper
ions at trace levels on multiwalled carbon nanotubes [11]. A
solid phase extraction procedure for trace rare earth elements
in various samples on multiwalled carbon nanotubes prior to
their inductively coupled plasma atomic emission
spectrometric determinations has been presented [13]. The
potential usage of multiwalled carbon nanotubes as a solid
phase extraction adsorbent for the preconcentration of trace
Cd, Mn and Ni has been investigated by Liang et al. [14]. Li et
al. have studied on the adsorption of lead [15] and cadmium
[16] ions on carbon nanotubes.
In the presented paper, a preconcentration–separation
procedure for traces lead ion as their Dithizon chelates on
multiwalled carbon nanotubes the effects of matrix ions of
natural waters and some transition metals on the recoveries of
the analyte ion were also examined in the model solutions.
Tests of addition/recovery for analyte ions in real samples
were performed with satisfactorily results. The detection limits
1
(3 s) for the analyte ion was in the range of 0.30–0.60 μg lP
P.
The concentrations of analyte in standard reference materials
such as (NIST RM 8418 Wheat gluten) pretreated by the
presented method were measured with FAAS and the
analytical values were well agreed with the certified values
and the reference values without the interference of major
components.
*Corresponding author: Tavallali@yahoo.com
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6th Nanoscience and Nanotechnology Conference, zmir, 2010 780