- Type of paper
: Paper in journal
Title: Determination of Sulfuric and Alkybenzensulfonic Acid
- Authors:
- Sak-Bosnar, Milan (130381)
- Zelenka, Lj.
- Budimir, Milana
Journal: Tenside Surfactants Detergents
Number: 4
ISSN: 0040-3490
Volume: 29
Year: 1992
Pages: from 289 to 291
Number of references: 10
Language: engleski
Summary: A single differential potentiometric titration method is
described for the determination of sulfuric andalkylbenzenesulfonic acid in
detergent intermediates, both acids were simultaneously titrated with a
standard solution of triethylamine. The determination is based upon a
different strenght of protons from sulfuric and organic acid sausing two
end points in the titration curve. The method is rapid and accurate and is
very useful for routine use because of its simplicity.
Keywords: sulfuric acid, alkylbenzensulfonic acid, different potentiometric titration, triethylamine,
- Type of paper
: Paper in proceedings
Title: The electrochemical characterization of chemically
synthesized polypyrrole in nonqaueous medium
- Authors:
- Budimir, Milana
- Sak-Bosnar, Milan (130381)
- Kovač, S.
- Kukulj, D.
- Duić, Lj.
- Editors
- Davidović, Đurađ
Proceedings title: Jugoslovenski simpozij o elektrohemiji
Language: hrvatski
Place: Banja Luka, Bosna i Hercegovina
Year: 1991
Pages: from 86 to 87
Meeting: XII jugoslovenski simpozij o elektrokemiji
Held: from 06/03/91 to 06/08/91
Summary: Pyrrole was chemically polimerized in acetonitrile using
iodineand bromine as oxidant and doping agent. The influence of time
ofpolimerization and molar ratio oxidant/pyrrole, as well astemperature of
polymerization, on the conductivity of synthesizedpolymer, were
investigated. The results of investigations show,that besides of
polymerization temperature, the doping agentcontent influences the
conductivity of the polymer obtained.
Keywords: conducting polypyrrole, chemical polymerization, electrochemical characterization,
- Type of paper
: Paper in proceedings
Title: Determination of calcium and magnesium in milk products by
potentiometric titration using calcium-selective electrode
Pt-CW/(DEHP)2Ca-AAP
- Authors:
- Matešić, Ružica (126601)
- Ferlin, V.
- Dimitrijević, M.
- Sak-Bosnar, Milan (130381)
Proceedings title: Jugoslovenski simpozij o elektrohemiji-knjiga radova
Language: hrvatski
Place: Banja Luka, Bosna i Hercegovina
Year: 1991
Pages: from 217 to 218
Meeting: XII jugoslovenski simpozij o elektrokemiji
Held: from 06/03/91 to 06/08/91
Summary: Calcium coated wire ion-selective electrode based on PVC
matricewith calcium bis/di-(2-ethylhexyl) phosphate/ sensor
andoctyl-diphenyl phosphate (AAP) plasticizer has been prepared.
Theelectrode was applied to the direct calcium and indirectmagnesium
determination in some real system (milk and milkproducts). The results of
the investigations have been comparedto the results obtained by standard
methods.
Keywords: calcium-selective electrode, potentiometric titration, calcium and magnesium determination, milk products,
- Type of paper
: Paper in proceedings
Title: Potenciometric Determination of Soaps Using a New
Sufracant-Selective Electrodes
- Authors:
- Matešić, Ružica (126601)
- Bilić, Mate (134161)
- Sak-Bosnar, Milan (130381)
- Editors
- Biškup, B.
- Despotović, R.
- Nemet, Z.
Proceedings title: Zbornik radova prvog simpozija Hrvatskog društva za tenzide
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 80 to 88
Meeting: Prvi simpozij Hrvatskog društva za tenzide
Held: from 05/25/93 to 05/27/93
Summary: Benzethonium chloride (Hyamine 1622) forms an ion
associationwith sodium-dodecylsulfate (SDS) having a mole ratio of
1:1(Hy+:DS-).The sensor alone was dissolved in a mixture ofplasticizer
(o-NPOE), organic solvent (THF) and PVC. Agraphite-PTFE electrode of
Ružička type, a platinum and silverelectrodes have all been coated with a
mixture. The response ofthese electrodes have been examined in
sodium-dodecylsulfate. Theelectrodes showed super-Nernstian response to DS
anion in theregion from 10(-2)-10(-6) moldm (-3) at 25'C. All
electrodesdeveloped have been used as end-point indicator forpotenciometric
titration of several K-sopas using standardHyamine 1622 solution as
titrant. The preliminary results of theinvestigation have been compared to
the results obtained withtwo-phase titration method.
Keywords: surfactant-selective electrodes, potentiometric determination of soaps,
- Type of paper
: Summary in proceedings
Title: Potentiometric determination of soaps using new surfactant
sensors
- Authors:
- Pavošević, Z.
- Sak-Bosnar, Milan (130381)
- Bilić, Mate (134161)
Proceedings title: 33rd IUPAC Congress Budapest
Language: engleski
Place: Budimpešta, Mađarska
Year: 1991
Pages: from 108 to 0
Meeting: 33rd IUPAC Congress
Held: from 08/17/91 to 08/22/91
Summary: The determination was based on the ion-pair titration of
carboxylate anions with cationic surfactants. A few sensors were tested for
the end-point detection of potentiometric titration. The synthesis of
sensors, preparation of the electrodes, selection of the conducting
substrates, and composition of the plastic membrane have been investigated.
Keywords: surfactant sensor, potentiometric titration, soap determination,
- Type of paper
: Summary in proceedings
Title: The application of potentiometric sensors for the study of
chemical synthesis and characterization of polyaniline
- Authors:
- Budimir, Milana
- Sak-Bosnar, Milan (130381)
- Kovač, S.
- Mandić, D.
Proceedings title: 33rd IUPAC Congress Budapest
Language: engleski
Place: Budimpešta, Mađarska
Year: 1991
Pages: from 256 to 0
Meeting: 33rd IUPAC Congress
Held: from 08/17/91 to 08/22/91
Summary: Polyaniline has been chemically synthesized using ammonium
peroxodisulphate as oxidant and chloride ion as dopant. The course if
synthesis was followed simultaneously two potentiometric sensors (pH and
redox sensor). The recorded E.m.f.curves offer a deeper insight in the
course of synthesis and contribute to the better understanding of reaction
mechanism.
Keywords: conducting polyaniline, chemical synthesis, potentiometric sensors,
- Type of paper
: Summary in proceedings
Title: The Application of Ružička-Type Graphite-PTFE
Calcium-Selective Electrode for Calcium Determination
- Authors:
- Matešić, Ružica (126601)
- Dimitrijević, M.
- Sak-Bosnar, Milan (130381)
Proceedings title: XII. skup hrvatskih kemičara
Language: hrvatski
Place: Zagreb
Year: 1991
Pages: from 0 to 0
Meeting: XII. skup hrvatskih kemičara
Summary: The applicability of the calcium ion-selective
graphite-poly(tetrafluoro ethylene) electrode od Ružička type is
demonstrated for the determination of calcium by potentiometry and
potentiometric titration in pure and some real systems. The influence of
different buffer-systems on the shape of titration curves has been
discussed. The analytically useful pH range is 6 to 12. The electrode
provides results agreeing with those obtained with commercially available
electrode and standard method.
Keywords: calcium-selective electrode, potentiometry, water-analysis,
- Type of paper
: Summary in proceedings
Title: Development and Application of Some Carboxylate-Sensor
Materials
- Authors:
- Bilić, Mate (134161)
- Matešić, Ružica (126601)
- Sak-Bosnar, Milan (130381)
Proceedings title: XIII. skup hrvatskih kemičara i II. simpozij Ekološka racionalnost
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 191 to 0
Meeting: XIII. skup hrvatskih kemičara
Held: from 02/10/93 to 02/11/93
Summary: The four different surfactant sensing materials, based
onion-pair associates of benzethonium chloride (Hyamine 1622) and
carboxylate anions (myristate, plamitate, stearate, oleate), have been
synthesized. The sensors were incorporated in PVC membrane mixture and
coated on Ružička-type PTFE electrode as conducting substrate. The
electrode was successfully used as end-point indicator for potentiometric
titration of several Na- soaps solutions using standard Hyamine 1622
solution as titrant.
Keywords: ion-pair associates, potentiometric titration, carboxylate anions,
- Type of paper
: Summary in proceedings
Title: Potentiometric Titration of Anionic Surfactants and Some
Carboxylate Anions Using Calcium-Phosphonate Ca(HO3PC7H15)2 Based
Ion-Selective Electrode
- Authors:
- Matešić, Ružica (126601)
- Bilić, Mate (134161)
- Sak-Bosnar, Milan (130381)
- Editors
- Vrbešić, Darko
Proceedings title: Ružičkini dani, Sastanak kemičara i tehnologa Slavonije i Baranje
Language: hrvatski
Place: Belišće, Republika Hrvatska
Year: 1993
Pages: from 41 to 0
Meeting: Ružičkini dani, Sastanak kemičara i tehnologa Slavonije i Baranje
Held: from 09/23/93 to 09/24/93
Summary: The response of calcium-phosphonate Ca(HO3PC7H15)2 based
ion-selective electrode have been examined in sodium-dodecylsulfate (SDS)
and several carboxylate anions. The sensor were incorporated in PVC
membrane mixture and coated on Ružička-typePTFE electrode and Platinum
electrode. The electrodes developed have been used as end-point indicators
for the potentiometric titration of samples.
N-Cetyl-N,N,N-trimethylammonium-bromide(CETAB), a cationic surface active
agent, is used as titrant.
Keywords: surfactant-selective electrode, anionic surfactant, carboxylate-anions, potentiometric titration,
- Type of paper
: Summary in proceedings
Title: Determination of Glucose Oxydase Kinetic Constants Using
Potentiometric Method
- Authors:
- Bučević, Brankica (141765)
- Has-Schon, Elizabeta (74333)
- Sak-Bosnar, Milan (130381)
Proceedings title: XIII. skup hrvatskih kemičara i II. simpozij Ekološka racionalnost
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 180
Meeting: XIII. skup hrvatskih kemičara
Held: from 02/08/93 to 02/10/93
Summary: The oxidation reaction of D(+)-glucose, catalyzed by the
enzyme glucose-oxydase, as well as the quantity of produced gluconic acid,
have been followed by direct potentiometry and potentiometric titration
method. The optimal conditions for the enzyme action have been established
(enzyme and substrate concentration, pH, temperature, enzyme stability in
water solution, inhibitors). The kinetic constans of the investigating
enzyme have also been determined.
Keywords: glucose-oxydase, potentiometry, kinetic constants,
- Type of paper
: Summary in proceedings
Title: D(+) Glucose Determination Using Electrochemical Sensors
- Authors:
- Bučević, Brankica (141765)
- Has-Schon, Elizabeta (74333)
- Sak-Bosnar, Milan (130381)
Proceedings title: 6. jugoslavenski simpozij analitičke kemije (YUSAC)
Language: hrvatski
Year: 1991
Pages: from 0 to 0
Meeting: 6. jugoslovenski simpozij analitičke kemije (YUSAC)
Summary: The quantity of gluconic acid produced by the action of
enzymeglucose oxydase on the D(+)glucose has been detected using
directpotentiometry and potentiometric titration (H+ and Ptelectrodes). The
parameters affecting this enzymatic reactionhave been investigated (enzyme
and substrate concentration, pH,temperature, ionic strength, enzyme
stability in water solution,effect of inhibitors), thus providing optimal
conditions forquantitative, reproducible and sensitive method of
D(+)glucosedetermination in water solutions.
Keywords: glucose-oxydase, electrochemical sensors, quantitative determination,
- Type of paper
: M.A.
Title: Investigation of Enzyme Glucosa Oxidase Using
Potentiometric Method
Faculty: Prirodoslovno-matematički fakultet, Postdiplomski studij prirodnih znanosti (Kemija/Biokemija) Sveučilište u Zagrebu
Author: BUČEVIĆ BRANKICA
Date of defense: 05/12/94
Language: hrvatski
Number of pages: 94
Summary: Direct potentiometry has been used to measure the enzyme
glucosa oxidase (EC 1.1.3.4.) activity from Aspergillus niger and
Hypomyces. Hydrogen ion concentration changes liberated in the course of
reaction have caused potential changes, registrated bz glass/calomel
electrode pair. Enzyme activity has been calculated from particular
reaction phases and expressed as the quantity of hydrogen ion liberated in
pertinent time unit per mg of enzyme preparation. At the very beginning of
the reaction potential changes have been shown to highly correlate with
enzyme activity. Determined enzyme activities have been used to calculate
Michaelis constants and maximal velocities. Direct potentiometry results
have been confirmed bz potentiometric titration.
Keywords: glucosa oxidase, potentiometry, kinetic constants
- Type of paper
: Mentorship
Title: Investigation of Enzyme Glucosa Oxidase Using
Potentiometric Method
Faculty: Prirodoslovno-matematički fakultet, Postdiplomski studij prirodnih znanosti (Kemija/Biokemija) Sveučilište u Zagrebu
Mentor: HAS-SCHON ELIZABETA
Date of defense: 05/12/94
Number of pages: 94
Author: Bučević Brankica
Degree level: M.A.
- Type of paper
: Other
Title:
