8446

7827

كارشناسي ارشد

شيمي تجزيه

اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي

1392

دوازده،59ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

شيمي

ID7827

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

61 Optical sensor for determination of ammonia Pb2 and Hg2 ions in aqueous solutions Fatemeh Farhadian Babadi fatemefarhadiyan@yahoo com 2013 Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsSupervisor Kiomars Zargoosh Dr Kiomarszargoosh@cc iut ac irAbstract A highly sensitive and selective optical membrane for determination of Hg2 and Pb2 in industrialwastes spiked tap water and natural waters has been developed by covalent immobilization of dithizoneon agarose membrane In addition to its high stability reproducibility and relatively long lifetime theproposed optical sensor revealed good selectivity for target ions over a large number of alkali alkalineearth transition and heavy metal ions The proposed optical membrane displays linear responses from1 1 10 8 to 2 0 10 6 mol L 1 and 1 2 10 8 to 2 4 10 6 mol L 1 for Hg2 and Pb2 respectively The limits of detection based on IUPAC method were 2 0 10 9 mol L 1 and 4 0 10 9 mol L 1 forHg2 and Pb2 respectively A highly selective and low cost optical membrane for sensing dissolved ammonia based on thesimultaneous production and immobilization of Fe2O3 nanoparticles onto agarose membrane wasprepared The proposed method has no problems about fuel consumption and environmental pollutionby toxic solvents The phase size and morphology of the prepared iron oxide nanoparticles werecharacterized by scanning electron microscopy atomic force microscopy FT IR spectroscopy and X ray diffraction The proposed sensor displays a linear response for ammonia over a concentration rangeof 1 3 10 7 to 4 2 10 5 mol L 1 with a limit of detection of 3 1 10 8 mol L 1 and a response time ofless than 3 min In addition to its high stability reproducibility and relatively long lifetime the proposedoptical sensor revealed good selectivity for ammonia over potential interfering species Key Words Heavy metal Optical sensor Dithizone Agarose Hg2 Pb2 Ammonia Fe2O3 nanoparticle

كيومرث زرگوش

حسن قاضي عسگر، بهزاد رضايي