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

P
NanoscienceT
Poster Session, Thursday, June 17
Theme F686 - N1123
Determination of Mercury(II) in Water and Wastewater Samples by Cold Vapor Atomic
Absorption Spectrometry After Sepration/Preconcentration with 2-Mercaptobenzothiazole
Immobilized on Alumina-Coated Magnetic Nanoparticles
1
Mohammad Ali KarimiP P, Laleh Sotudehnia KoraniP P, UAsghar Askarpour KabirUP P*
PDepartment of Chemistry &T
1
1
and TNanotechnology Research LaboratoryT (NNRL), Payame Noor University (PNU), Sirjan 78185-
347, Iran
Abstract- In this work first we have synthesized alumina coated magnetite nanoparticles (ACMNPs) and then a simple and new
method has been developed for the separation/preconcentration of trace amounts of mercury ion from aqueous samples for subsequent
measurement by cold vapor atomic absorption spectrometry (CVAAS) based on the adsorption of its 2-mercaptobenzothiazole
complex on modified ACMNPs. The preconcentration factor of the adsorbent at optimum conditions was found as 100. The relative
-1
standard deviation and the detection limit for measurement of Hg(II) in our experiments were less than 2.3% (n =5) and 0.04 ng mLP P,
respectively. The practical applicability of the developed sorbent was examined using water and wastewater samples.
1
Determination of mercury in environmental samples is of
great importance nowadays, because mercury is particularly
toxic element and a widely distributed environmental pollutant
because it is widespread in the lithosphere and in water
Inorganic mercury, especially soluble mercury species, can be
transformed into methyl mercury by the action of
microorganisms and can be accumulated in the tissue of fishes
and birds [1,2]. So, its concentration should be kept under
permanently controlled conditions. We use solid-phase
extraction (SPE) for separation and preconcentration trace
amounts of Hg(II) in different water samples for subsequent
measurement by CVAAS technique [3-5].
In this method, MNPs of FeR3ROR4R were synthesized and then
in alcoholic environment their surface coated with AlR2ROR3R and
sodium dodecyl solfate (SDS). In the after stage a chelating
agent of 2-mercaptobenzothiazol (MBT) for separation this
ionR Rhave been immobilized on modified ACMNPs
(abbreviated as MISACMNPs), as the adsorbent for the
preconcentration of mercury ion from aqueous sample
solutions, has been presented. Then isolated by an adscititious
magnet and the adsorbed Hg ions were eluted with HBr
solution. The MNPs, ACMNPs and MISACMNPs were
characterized by XRD, SEM, TEM and FT-IR spectroscopy.
The influence of various parameters such as acidity, eluting
agents, SDS and MBT concentrations, sample volume, NPs
amounts, interfering ions, time for adsorption and desorption,
etc have been studied and established in details.
In order to check the applicability of the proposed method it
was applied to the seperation/preconcentration and
determination of mercury in water and wastewater samples.
According obtained results, the added mercury ions can be
quantitatively recovered from the water samples by the
proposed procedure. This sorbent was successfully applied for
convenient, fast, simple and efficient enrichment of trace
amounts of mercury ions from environmental water and
wastewater samples.
Easy regeneration is another property of ACMNPs, and the
experiments have proved that these ACMNPs can be reused at
least 3 times on average without the obvious decrease of
recovery after wash/calcine procedures. Furthermore, it avoids
the time-consuming column passing (about 1 h in
conventional SPE method) and filtration operation, and no
clean-up steps were required.
A comparison of the represented method with the other
reported methods showed that the detection limit of the
proposed method is comparable to those in reported methods.
The authors are grateful for the financial support of the
Nanoscience and Nanotechnology Research Laboratory
(NNRL) of Sirjan Payam Noor University for this work.
Figure 1. SEM images of FeR3ROR4 Rnanoparticles (a) and alumina coated
FeR3ROR4 Rnanoparticles (b).
*Corresponding author: a_askar_kabir@yahoo.com
[1] B.C. Mondal, D. Das, A.K. Das, Anal. Chim. Acta 450, 223
(2001).
[2] F.W. Fifield, P.J. Haines, Environmental Analytical Chemistry,
2nd ed (Lackwell Science Ltd, Oxford, UK, 2000).
[3] Q. He, X. Chang, H. Zheng, N. Jiang, and X. Wang, Inter. J.
Environ. Anal. Chem. 88, 373(2008).
[4] C.M.F. Hernandez, A.N. Banza, E. Gock, J. Hazard. Mater. 139,
25 (2007).
[5] E.M. Soliman, M.B. Saleh, S.A. Ahmed, Talanta 69, 55 (2006).
6th Nanoscience and Nanotechnology Conference, zmir, 2010 809