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

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P P Poster Session, Thursday, June 17 Theme F686 - N1123 Titanium Dioxide (TiOR2R) Genotoxicity in Human Lymphocytes Assessed By The Alkaline Comet Assay 1 1 1 1 2 2 1 UFunda DemirtaUP P*, Gökçe TanerP P, Fatma ÜnalP P, Zekiye SuludereP P, Özlem ErolP P, Halil brahim ÜnalP P, Deniz YüzbaoluP PDepartment of Biology, Gazi University, Ankara 06500, Turkey PDepartment of Chemistry, Gazi University, Ankara, 06500, Turkey 2 1 Abstract -In this study the genotoxicity of nano Titanium dioxide (TiOR2R) (
P P P P Poster Session, Thursday, June 17 Theme F686 - N1123 1 Flame Atomic Absorption Spectrometric Determination of Silver Ion After Preconcentration on Modified Iron Oxide Magnetic Nanoparticles 1 2 1 UMohammad Ali KarimiUP P*, Hossein TavallaliP P, Asghar Askarpoor KabirP P, Maryam Kazemi pourP 3P, Najmeh Afsahi 3 PDepartment of Chemistry & Nanoscience and Nanotechnology Research Laboratory (NNRL), Payame Noor University (PNU), Sirjan 78185- 347, Iran 2 PDepartment of Chemistry, Payame Noor University (PNU), Shiraz, Iran 3 PDepartment of Chemistry, Islamic Azad University of Kerman, Kerman, Iran Abstract—In this research first we have synthesized magnetite nanoparticles (MNPs) and alumina coated magnetite nanoparticles (ACMNPs) and then a simple and new method has been developed for the separation/preconcentration of trace amounts of silver ion from aqueous samples for subsequent measurement by flame atomic absorption spectrometry (FAAS) based on the adsorption of its dithizone (DTZ) complex on modified alumina-coated magnetic nanoparticles. The preconcentration factor of the adsorbent at optimum conditions was found as 100. The -1 relative standard deviation and the detection limit for measurement of Ag(I) in our experiments were less than 3.4 % (n =10) and 0.52 ng mLP P, respectively. The practical applicability of the developed sorbent was examined using water and wastewater samples. In recent years, great attention has been paid to the application of nano-structure materials, especially nanosized magnetic particles. These materials have been used in various scientific fields such as biotechnology, engineering, biomedical, environmental and material science [1-3]. A distinct advantage of these is that magnetic nanoparticles (MNPs) can be readily isolated from sample solutions by the application of an external magnetic field. Surface modification of magnetic nanoparticles is a challenged key for different applications and can be accomplished by physical/chemical adsorption of organic and inorganic species [4,5]. Solid phase extraction (SPE) is a routine extraction method for determining trace level contaminants in environmental samples [6]. Many research groups have explored the application of several nanosized SPE adsorbents such as nanoparticles (NPs), nanocomposites and nanotubes [7,8]. In this study, at first step the magnetic nanoparticles were synthesised and then coated with alumina subsequently modified with DTZ as extractor, with aid of sodium dodecyl sulfate (SDS), based on the ion pair formation and simple physical adsorption. DTZ was incorporated into the inner hydrophobic part of produced admicelles in ammoniacal mixture of DTZ, SDS and alumina-coated magnetic nanoparticles (ACMNPs) was acidified to produce an assemble (abbreviated as DSIACMNPs) suitable for preconcentration and determination of silver(I) ion . Silver ions are adsorbed on DSIACMNPs were isolated by an adscititious magnet and the adsorbed analyte was eluted with thiourea solution and quantified using according Figure 1. To enable practical application of ACMNPs, it is most important that the sorbents should possess superparamagnetic properties. Magnetic properties were characterized VSM and result show both of the magnetic nanoparticles (MNPs and ACMNPs) exhibited typical superparamagnetic behavior due to not exhibiting hysteresis, remanence and coercivity. The modified ACMNPs were also confirmed by FT-IR, SEM, TEM and XRD analysis. The result shows that the the particles are hemi-spherical and diameters of MNPs and ACMNPs are is in the range of 4-9 and 16-21 nm, respectively and revealed that the resultant nanoparticles were pure FeR3ROR4R with a spinel structure and the immobilized process did not change its crystal phase and confirm binding mechanism too. In this study, the new adsorbents of DSIACMNPs were prepared easily and low-costly, utilized conveniently and harmless to environment. These sorbents were successfully applied for convenient, fast, simple and efficient enrichment of trace amounts of silver ions from environmental water and wastewater samples. Magnetic separation in the method shortened analysis times greatly. The main benefits of the methodology were: no use of toxic organic solvent, simplicity, low cost, enhancement of sensitivity, and rapid analysis time (total time of a single determination is about 27 min) and low LOD. Easy regeneration is another property of ACMNPs, and the experiments have proved that these ACMNPs can be reused at least 4 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. *Corresponding author: ma_karimi43@ yahoo.com Figure 1. Procedure for magnetic solid-phase extraction. Optimal experimental conditions including SDS and DTZ concentrations, pH, sample volume, eluent conditions and coexisting ions have been studied and established. [1] M. Faraji, Y. Yamini, M. Rezaee, J. Iran. Chem. Soc. 7, 1 (2010). [2] C. W. Lu, Y. Hung, J. K. Hsiao, M. Yao, Nano Lett. 7, 149(2007). [3] S. Zhang, X.Zhao, H.Niu, Y. Shi, J. Hazard. Mater. 167, 560 (2009) [4] J.S. Suleiman, B. Hu, H. Peng, C. Huang, Talanta 77, 1579 (2009). [5] J. S. Becker, O. R. T. Thomas, M. Franzreb, Sep. Purif. Technol. 65, 46 (2009). [6] V. Camel, Spectrochim. Acta B 58, 1177–(2003). [7] J. D. Li, X. L. Z hao, Y. L. Shi, J. Chromatogr. A 1180, 24 (2008). [8] A. Stafiej, K. Pyrzynska, Microchem. J. 89, 29 (2008). 6th Nanoscience and Nanotechnology Conference, zmir, 2010 806
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