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252 LIDIA VARVARI, SORIN-AUREL DORNEANU, IONEL CĂTĂLIN POPESCU PCI – 6024 E interface PC – AO – 2DC interface Figure 5. The scheme of the computer-controlled device used for the ISE potentiometric measurements; MS – magnetic stirrer; P – peristaltic pump IV. Experimental procedure Before use, all electrodes were conditioned for at least 24 hours in the solution containing the cation to be determined. The experimental procedure consisted in two main parts: in the first one, the potentiometric response of the prepared membranes was recorded for Ca 2+ , Mg 2+ , Na + , K + , NH4 + and Li + using separate solutions, and the corresponding calibration curves were recorded. In the second part, the ionic interference between K + and different common cations was examined. All potentiometric measurements were performed in batch mode, using the standard addition method for the preparation of standard solutions. For the interference study, the method of fixed primary ion concentration was used: the primary ion concentration was kept constant, while the concentrations of the interfering ions were increased. ACKNOWLEDGMENTS Electrode 1 Electrode 2 Electrode 3 Electrode 4 Ref. electrode Electrochemical interface Controll unit Electrochemical cell The authors are grateful to dr. Elisabeth-Jeanne Popovici from the “Raluca Ripan” Chemistry Research Institute for providing the compound C6Es6 and to ANCS for the financial support. MS P
POTASSIUM-SELECTIVE ELECTRODE BASED ON A CALIX[6]ARENIC ESTER (C6ES6) REFERENCES 1. E. Bakker, D. Diamond, A. Lewenstam, E. Pretsch, Anal. Chim. Acta, 1999, 393, 11. 2. E. Bakker, P. Buhlmann, E. Pretsch, Chem. Rev., 1997, 97, 3083. 3. P. Buhlmann, E. Pretsch, E. Bakker, Chem. Rev., 1998, 98, 1593. 4. V. Arora, H. M. Chawla, S. P. Singh, ARKIVOC, 2007, 2, 172. 5. R. Ludwig, N. T. K. Dzung, Sensors, 2002, 2, 397. 6. K. Belhamel, R. Ludwig, M. Benamor, Microchimica Acta, 2005, 149, 145. 7. T. D. Chung, H. Kim, Journal of Inclusion Phenomena and Molecular Recognition in Chemistry, 1998, 32, 179. 8. V. S. Bhat, V. S. Ijeri, A. K. Srivastava, Sensors and Actuators B, 2004, 99, 98. 9. V.K. Gupta, R. N. Goyal, M. Al Khayat, P. Kumarc, N. Bachheti, Talanta, 2006, 69, 1149. 10. A.K. Jain, V.K. Gupta, L. P. Singh, J. R. Raisoni, Electrochimica Acta, 2006, 51, 2547. 11. S. A. Dorneanu, V. Coman, I. C. Popescu, P. Fabry, Sensors and Actuators B, 2005, 105, 521. 253
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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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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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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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194 OCTAVIAN STAICU, VALENTIN MUNTE
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ln(τ i / s) OCTAVIAN STAICU, VALEN
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198 OCTAVIAN STAICU, VALENTIN MUNTE
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