8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

Fri 911:10-14:00P4.41Poly-vinylimidazole synthesis for voltammetric nitritedeterminationAyca Orbay, 1 Gülcemal Yildiz, 2 and B. Filiz Senkal 21 Istanbul Technical University, Faculty of Science and Letters, Department of ChemistryMaslak 34469, Istanbul, Turkey2 Istanbul Technical University, Istanbul, TurkeyPolyvinylimidazole (PVI) is a weak basic polyelectrolyte which is easy to synthesize and purify.There are previous studies held on PVI’s adsorption features [1-3], modification on multiwalledcarbon nanotube [4] and complexation of uranyl ion [5]. The aim of this study is to determine aneasier, quicker, cheaper and more effective way to analysis of nitrite by using PVI as a modifyingagent at the carbon paste electrode for voltammetric measurements. PVI-resin was prepared bymixing hydro gel vinylimidazole, tetraallyl ammonium bromide in cross-linker environment andaqueous azo-bis-cyanovaleric acid initiator. Optimum values for voltammetric determination of nitrite,the pH, percentage of modifying agent, preconcentration time and potential were determinedby cyclic voltammetry, differential pulse voltammetry and chronoamperometry. Measurementshave shown that PVI modified electrode has electrocatalytic activity towards nitrite oxidation. Theresults have shown that the poly vinylimidazole modified carbon paste electrode has improved thenitrite determination 4 times better than the bare carbon paste electrode. The method was alsoapplicated to real samples like meat product with standard addition method. [1] Tekin N. , KadinciE. , et al. , Microporous and Mesoporous Materials, 93, 125-133 (2006). [2] Tekin N. , KadinciE. , et al. , Journal of Colloid and Interface Science, 296, 472-479 (2006). [3] Roques-CarmesT. , et al. , Journal of Colloid and Interface Science, 256, 273-283 (2002). [4] Yang Z. , Pu H., Yin J. , Material Letters, 59, 2838-2841 (2005). [5] Martinot L. , Leroy D. , et al. , Journal ofRadioanalytical and Nuclear Chemistry 224, 71-76 (1997).41