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246 SIMONA VARVARA, MARIA POPA, LIANA MARIA MURESAN 5. L. Muresan, S. Varvara, E. Stupnisek-Lisac, H. Otmacic, K. Marusic, S. Horvat Kurbegovic, L. Robbiola, K. Rahmouni, H. Takenouti, Electrochimica Acta, 2007, 52, 7770. 6. H. Ma, S. Chen, L. Niu, S. Zhao, S. Li, D. Li, Journal of Applied Electrochemistry, 2002, 32, 65. 7. J.B. Matos, L.P. Pereira, S.M.L. Agostinho, O.E. Barcia, G.G.O. Cordeiro, E. D’ Elia, Journal of Electroanalytical Chemistry, 2004, 570, 91. 8. S.A. Abd El-Maksoud, Electrochimica Acta, 2004, 49, 4205. 9. K.F. Khaled, Materials Chemistry and Physics, 2008, 112, 104. 10. D. Zhang, L. Gao, G. Zhou, K.Y. Lee, Journal of Applied Electrochemistry, 2008, 38, 71. 11. S.M. Milic, M.M. Antonijevic, Corrosion Science, 2009, 51, 28. 12. M.A. Kiani, M.F. Mousavi, S. Ghasemi, M. Shamsipur, S.H. Kazemi, Corrosion Science, 2008, 50, 1035. 13. K. M. Ismail, Electrochimica Acta, 2007, 52, 7811. 14. E. Stupnisek-Lisac, A. Gazivoda, M. Madzarac, Electrochimica Acta, 2002, 47, 4189. 15. A.A. E.Shafei, M.N.H. Moussa, A.A. ElFar, Journal of Applied Electrochemistry, 1997, 27 1075. 16. E. Oguzie, Y. Li, F.H. Wang, Electrochimica Acta, 2007, 53, 909. 17. M. S. Morad, Journal of Applied Electrochemistry, 2008, 38, 1509. 18. A.B. Silva, S.M.L. Agostinho, O.E. Barcia, G.G.O. Cordeiro, E.D’Elia, Corrosion Science, 2006, 48, 3668. 19. P. Singh, K. Bhrara, G. Singh, Applied Surface Science, 2008, 254, 5927. 20. M.M. El-Rabiee, N.H. Helal, Gh.M. A. El-Hafez, W.A. Badawy, Journal of Alloys and Compounds, 2008, 459, 466. 21. N.H. Helal, M.M. El-Rabiee, Gh.M. Abd El-Hafez, W.A. Badawy, Journal of Alloys and Compounds, 2008, 456, 372. 22. J.B. Matos, L.P. Pereira, S.M.L. Agostinho, O.E. Barcia, G.G.O. Cordeiro, E. Delia, Journal of Electroanalytical Chemistry, 2004, 570, 91. 23. D.-Q. Zhang, Q.-R. Cai, L.-X. Gao, K.Y. Lee, Corrosion Science, 2008, 50, 3615. 24. D.-Q. Zhang, Q.-R. Cai, X.-M. He, L.-X. Gao, G.-D. Zhou, Materials Chemistry and Physics, 2008, 112, 353. 25. D.-Q. Zhang, L.-X. Gao, G.-D. Zhou, Journal of Applied Electrochemistry, 2005 35, 1081. 26. D.-Q. Zhang, Q.-R. Cai, X.-M. He, L.-X. Gao, G.S. Kim, Materials Chemistry and Physics, 2009, 114, 612. 27. K. Bauroni, L. Bazzi, R. Saghi, M. Mihit, B. Hammouti, A. Albourine, S. E. Issami, Materials Letters, 2008, 62, 3325. 28. S. Varvara, M. Popa, G. Rustoiu, R. Bostan, L. Muresan, Studia Universitatis Babes- Bolyai, Chemia, 2009, in press. 29. A. J. Bard, L. R. Faulkner, “Electrochemical methods. Fundamentals and Applications” (2 nd Edition), John Wiley & Sons Publisher, New York, 2001, chapter 10. 30. E. Stupnisek-Lisac, A. Gazivoda, M. Madzarac, Electrochimica Acta, 2002, 47, 4189.
STUDIA UNIVERSITATIS BABEŞ-BOLYAI, CHEMIA, LIV, 3, 2009 POTASSIUM-SELECTIVE ELECTRODE BASED ON A CALIX[6]ARENIC ESTER (C6Es6) LIDIA VARVARI a , SORIN-AUREL DORNEANU a , IONEL CĂTĂLIN POPESCU a * ABSTRACT. An ion-selective electrode (ISE) was elaborated based on a calyx[6]arenic ester (C6Es6) as ionophore and PVC as polymer matrix. Potentiometric measurements were performed in standard solutions of Ca 2+ , Mg 2+ , Na + , K + + + + , NH4 and Li . The best response was observed for K : slope 52 mV/ΔpK; linear range from 0.1 mM up to 0.1 M; detection limit of 0.02 mM; potentiometric selectivity coefficients of 0.06 and 0.16 for Na + + and NH4 , respectively. Keywords: calyx[6]arenic ester, PVC-based ISE, potassium ISE INTRODUCTION Ion-selective electrodes (ISE) are of great importance due to their wide applications mainly in clinical, food and environmental chemistry [1]. For example, it was estimated that, all over the world, over a billion of clinical analyses are performed annually using ISE [2]. Figure 1. The structure of C6Es6 ester a Department of Physical Chemistry, Babes-Bolyai University, 400028 Cluj-Napoca, Romania, *e-mail address: cpopescu@chem.ubbcluj.ro
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R /(mol m -2 s -1 ) 0.06 0.05 0.04
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ANA-MARIA CORMOS, JOZSEF GASPAR, AN
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Studia Universitatis Babes-Bolyai C
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6 PROFESSOR IOAN BÂLDEA AT HIS 70
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MARCELA ACHIM, DANA MUNTEAN, LAURIA
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STUDIA UNIVERSITATIS BABEŞ-BOLYAI,
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STUDIES ON WO3 THIN FILMS PREPARED
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PREPARATION AND CHARACTERIZATION OF
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32 C. CĂŢĂNAŞ, M. MOGOŞ, D. HO
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34 C. CĂŢĂNAŞ, M. MOGOŞ, D. HO
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C. CĂŢĂNAŞ, M. MOGOŞ, D. HORVA
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38 ANA-MARIA CORMOS, JOZSEF GASPAR,
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ANA-MARIA CORMOS, JOZSEF GASPAR, AN
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50 EUGEN DARVASI, LADISLAU KÉKEDY-
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MATHEMATICAL MODELING FOR THE CRYST
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STUDY OF THE CHROMATOGRAPHIC RETENT
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LOWER RIM SILYL SUBSTITUTED CALIX[8
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THE INTERACTION OF SILVER NANOPARTI
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OPTIMISATION OF COPPER REMOVAL FROM
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MELINDA-HAYDEE KOVACS, DUMITRU RIST
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IRON DOPED CARBON AEROGEL AS CATALY
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128 ANDRADA MĂICĂNEANU, HOREA BED
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ANDRADA MĂICĂNEANU, HOREA BEDELEA
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CRISTINA MIHALI, GABRIELA OPREA, EL
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144 CRISTINA MIHALI, GABRIELA OPREA
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146 Interfering ion, J - I - DBS -
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CONCLUSIONS 148 CRISTINA MIHALI, GA
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150 CRISTINA MIHALI, GABRIELA OPREA
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152 D. MIHU, L. VLASE, S. IMRE, C.
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154 Intens. x105 1.5 1.0 0.5 0.0 x1
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D. MIHU, L. VLASE, S. IMRE, C. M. M
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162 A. PETER, M. BAIA, F. TODERAS,
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164 (a) V relative [%] (c) V relati
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BIOSORPTION OF PHENOL FROM AQUEOUS
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186 ANDREI ROTARU, MIHAI GOŞA, EUG
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ANDREI ROTARU, MIHAI GOŞA, EUGEN S
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Page 187 and 188: 194 OCTAVIAN STAICU, VALENTIN MUNTE
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