LUCRARI STIINTIFICE

Senzori electrochimici | Chimie electroanalitica | Cercetare fundamentala |

CHIMIE ELECTROANALITICA APLICATA

1. C. Liteanu, E. Hopîrtean “Bietrage zum Problem der Äquivalenzpunktbestimmung VIII. Über die Characterisierung des qualitativven Sprunges im Äquivalenzpunkt bei der linearen Titration” Stud. Univ. Babes-Bolyai, Ser. Chem. 11 (1), p. 135, 1966
2. C. Liteanu, E. Hopîrtean “Le titrage conductometrique á resistance indicatrice I. Le titrage conductometrique de l’acide chlorhidrique en solution concentrées de chlorure de sodium” Rev. Roumaine Chim., 12, p. 517, 1967.
3. E. Hopîrtean, A. Tîrsar, C. Liteanu “Electrozi - membrane lichizi I. Utilizarea electrodului de tricrezilfosfat în titrarea potentiometrica de precipitare” Stud. Univ. Babes - Bolyai , Ser.Chem, 17 (2), p. 99, 1972.
4. E. Hopîrtean, M. Radu, O. Gabor “Studiu asupra electrodului - membrana PVC + plastifiant X. Utilizarea membranei PVC+ tricrezilfosfa în titrarea potentiometrica automata a unor acizi si baze” Stud. Univ. Babes - Bolyai, Ser. Chem., 18 (1), p. 111, 1973.
5. M. Mioscu, E. Hopîrtean, C. Liteanu “Liquid membrane - electrodes. II. The n-butanol-frit electrode in acid base potentiometric titration” Rev. Roumaine Chim., 18, p. 1637, 1973.
6. C. Liteanu, E. Hopîrtean, M. Mioscu “Liquid membrane - electrodes. III. Electrodes with water immiscible organic liquids in frit. Applications in potentiometric acid - base titrations” Rev. Roumaine Chim., 18, p. 1643, 1973.
7. E. Hopîrtean, M. Mioscu, C. Liteanu “Liquid membrane - electrodes. IV. Electrodes with water immiscible organic liquids in frit. Applications acid - base titration” Stud. Univ. Babes-Bolyai, Ser. Chem., 18 (1), p. 133, 1973.
8. E. Hopîrtean, M. Predescu “Study of the polimer+plasticizer membrane electrode. XII.Determination of the free acidity (H2SO4) in the presence of Cu2+ ions using a PVC + tricrezylphosphat membrane electrode” Stud.Univ. Babes-Bolyai, Ser. Chem., 19 (1), p. 108, 1974.
9. C. Liteanu, E. Hopîrtean, R. Vlad “Utilization of a Hg2+ - sensitive membrane-electrode in the determination of some a - aminoacids” Rev. Roumaine Chim., 21, p. 305, 1976.
10. C. Liteanu, E. Hopîrtean, I.C.Popescu, N.L.Kekedy, E. Veress, V. Liteanu “On a new procedure for obtaining of sulphur doixide starting from calcium sulphate. II. Utilization of phosphogypsum and natural gypsum with impurities” Rev. Roumaine Chim., 21, p. 1396, 1976.
11. E. Hopîrtean, P. Zugravescu, C. Achiri “Utilizarea electrodului-membrana lichid nitrat selectiv in controlul analitic industrial” Rev. Chim.(Bucuresti),, 27, p. 1085, 1976.
12. E. Hopîrtean, F. Kormos “Complexometric titration with Tungsten electrode” Stud. Univ. Babes-Bolyai,Ser. Chem. 1-2, p. 48, 1991
13. E. Hopîrtean, M. Horn “A potenthiometric method for lead determination in zinc-plating electrolytes” Stud. Univ. Babes-Bolyai, Ser. Chem. 1-2, p. 71, 1993
14. E. Hopîrtean, L. Olenic “Determinarea cromului din oteluri prin titrare complexonometrica potentiometrica” Rev. Chim.(Bucuresti), 44 (11), p. 952, 1993.
15. E. Hopîrtean, M. Horn “Metoda de determinare a aluminiului în oteluri înalt aliate potentiometric” Rev. Chim.(Bucuresti), 44 (9), p. 82, 1993.
16. E. Hopîrtean, V. Cosma “Aplicatii analitice ale electrodului membrana Cd2+ selectiv”
Rev. Chim.(Bucuresti), 45 (2), p. 151, 1994.
17. E. Hopîrtean, L. Olenic, Liviu Olenic “Determinarea cuprului din solutiile de cuprare chimica” Rev. Chim.(Bucuresti),, 45 (5), p. 430, 1994.
18. F. Kormos, E. Hopîrtean, Fl. Mihalcioiu, I. Tarsiche, I. Hopîrtean “Study of the Accuracy of the Determination of pH with Metal electrodes” Stud. Univ. Babes-Bolyai,Ser. Chem., XXXIX, 1996.
19 . L. Olenic, E. Hopîrtean, D. Vitelaru, L. Olenic “The Application of Potentiometric Differentia Cu(1)-Microdetector in Clinical Analysis” Stud. Univ. Babes-Bolyai , Ser.Chem., XXXIX, 1996.
20. E. Hopirtean, V. Cosma, A. Coroian, I. Hopirtean “Senzori potentiometrici cu suport PVC pentru determinarea NO3- si K+ Revista Asociatiei pentru Colaborari Interdisciplinare (ASCI), a specialistilor din Transilvania, 3, Cluj-Napoca, 1999
21. C. Liteanu, E. Hopîrtean “Etude sur les électrodes-membranes polimére + plastifiant. II. L’utilization de l’électrode membrane PVC tricresylfhosphate dans la titrage potentio metrique de HCl par NaOH” Talanta, 17, p.1067, 1970.
22. C. Liteanu, E. Hopîrtean “Use of the PVC + tricresylphosphate membrane as indicating electrode in potentiometric precipitation titration” Talanta, 19, p. 971, 1972.
23 . E. Hopîrtean, M. Chereches, C. Liteanu “The utilization of Ag2S membrane electrode in the complexometric deter mination of some divalent cations” Chem. Anal.(Warszawa), 20, p. 965, 1975.
24. E. Hopîrtean, C. Liteanu, R. Vlad “Utilization of an Hg2+ - sensitive membrane - electrode in the complexome tric determination of Bi3+, Fe3+ and Cr3+” Talanta, 22, p. 912, 1975.
25. F. Kormos, E. Hopîrtean “Potentiometric determination of drugs of alkaline character” Chem. Anal. (Warszawa), 37, p. 735, 1992.
26. E. Hopîrtean, V. Cosma, A. Coroian “Potentiometric determination of Nickel impurities in brasses”
27. I. Tarsiche, E. Hopîrtean, D. Ciurche “Last-Square Analysis of Ammonia Diffusion through PTFE Membranes” Meas. Sci. Tehnol. 8, p. 1367, 1997.
28. C. Liteanu, E. Hopîrtean “Utilizarea membranelor PVC + tricrezilfosfat ca electrod indicator în titrarea potentiometrica de precipitate” Lucrarile celei de-a III-a Conferinte Nationale de Chimie Analitica, Brasov, vol.1, p. 235, 1971.
29.C. Liteanu, E. Hopîrtean, M. Mioscu “Determination of some organic acids and bases by potentiometric titration in the presence of membrane electrodes” III-rd Analytical Chemical Conference, Budapest, vol. I, p. 53, 1970.