Photonic crystals in biology - NanoTR-VI

PNanoscienceTPoster Session, Thursday, June 17Theme F686 - N1123Determination of Mercury(II) in Water and Wastewater Samples by Cold Vapor AtomicAbsorption Spectrometry After Sepration/Preconcentration with 2-MercaptobenzothiazoleImmobilized on Alumina-Coated Magnetic Nanoparticles1Mohammad Ali KarimiP P, Laleh Sotudehnia KoraniP P, UAsghar Askarpour KabirUP P*PDepartment of Chemistry &T11and TNanotechnology Research LaboratoryT (NNRL), Payame Noor University (PNU), Sirjan 78185-347, IranAbstract- In this work first we have synthesized alumina coated magnetite nanoparticles (ACMNPs) and then a simple and newmethod has been developed for the separation/preconcentration of trace amounts of mercury ion from aqueous samples for subsequentmeasurement by cold vapor atomic absorption spectrometry (CVAAS) based on the adsorption of its 2-mercaptobenzothiazolecomplex on modified ACMNPs. The preconcentration factor of the adsorbent at optimum conditions was found as 100. The relative-1standard 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.1Determination of mercury in environmental samples is ofgreat importance nowadays, because mercury is particularlytoxic element and a widely distributed environmental pollutantbecause it is widespread in the lithosphere and in waterInorganic mercury, especially soluble mercury species, can betransformed into methyl mercury by the action ofmicroorganisms and can be accumulated in the tissue of fishesand birds [1,2]. So, its concentration should be kept underpermanently controlled conditions. We use solid-phaseextraction (SPE) for separation and preconcentration traceamounts of Hg(II) in different water samples for subsequentmeasurement by CVAAS technique [3-5].In this method, MNPs of FeR3ROR4R were synthesized and thenin alcoholic environment their surface coated with AlR2ROR3R andsodium dodecyl solfate (SDS). In the after stage a chelatingagent of 2-mercaptobenzothiazol (MBT) for separation thisionR Rhave been immobilized on modified ACMNPs(abbreviated as MISACMNPs), as the adsorbent for thepreconcentration of mercury ion from aqueous samplesolutions, has been presented. Then isolated by an adscititiousmagnet and the adsorbed Hg ions were eluted with HBrsolution. The MNPs, ACMNPs and MISACMNPs werecharacterized by XRD, SEM, TEM and FT-IR spectroscopy.The influence of various parameters such as acidity, elutingagents, SDS and MBT concentrations, sample volume, NPsamounts, 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 itwas applied to the seperation/preconcentration anddetermination of mercury in water and wastewater samples.According obtained results, the added mercury ions can bequantitatively recovered from the water samples by theproposed procedure. This sorbent was successfully applied forconvenient, fast, simple and efficient enrichment of traceamounts of mercury ions from environmental water andwastewater samples.Easy regeneration is another property of ACMNPs, and theexperiments have proved that these ACMNPs can be reused atleast 3 times on average without the obvious decrease ofrecovery after wash/calcine procedures. Furthermore, it avoidsthe time-consuming column passing (about 1 h inconventional SPE method) and filtration operation, and noclean-up steps were required.A comparison of the represented method with the otherreported methods showed that the detection limit of theproposed method is comparable to those in reported methods.The authors are grateful for the financial support of theNanoscience and Nanotechnology Research Laboratory(NNRL) of Sirjan Payam Noor University for this work.Figure 1. SEM images of FeR3ROR4 Rnanoparticles (a) and alumina coatedFeR3ROR4 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