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  • Volumetrie  (37)
  • kinetics
  • nitrogen
  • Springer  (45)
  • American Chemical Society
  • 1970-1974  (45)
Collection
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  • Springer  (45)
  • American Chemical Society
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Year
  • 1
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    Springer
    Journal of solution chemistry 2 (1973), S. 217-238 
    ISSN: 1572-8927
    Keywords: Cation ; energies ; H. S. Frank ; M. Eigen ; R. G. Wilkins ; kinetics ; ligand substitution ; mechanism ; mixed solvents ; nonaqueous ; solvation ; solvent ; solvent structure ; solvent exchange ; transition metal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The role of the solvent in reactions involving ions is considered in relation to the structure of liquids. The rate constants and activation parameters for ligand substitutions at divalent transition metal cations in various solvents are compared with those for solvent exchanges. The differences are related to structural properties of the solvents, represented by their heats of evaporation and fluidities, and interpreted with the aid of a model developed from that of Frank and Wen. Water is not a typical solvent.
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  • 2
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    Journal of solution chemistry 3 (1974), S. 881-887 
    ISSN: 1572-8927
    Keywords: Binary aqueous mixtures ; solubilities ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A treatment which predicts the solubilities of gases in solvent mixtures is examined in the context of the analysis of kinetic data for reactions in aqueous mixtures. The treatment is qualitatively successful to some extent in resolving the effects of changes in the initial state of the reacting substrate in the activation parameters.
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  • 3
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    European journal of clinical pharmacology 5 (1972), S. 111-115 
    ISSN: 1432-1041
    Keywords: Rifampicin ; kinetics ; multicompartmental analysis ; simultaneous serum urine and bile assessment ; one week treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary To aid interpretation of the fall in the serum concentrations of rifampicin observed in the early phase of continuous treatment, the distribution of the antibiotic was assessed simultaneously in the serum, bile, and urine of patients treated for one week. Transfer constants between these compartments were calculated on the 1st and 7th day of treatment by multicompartmental kinetic analysis. — The results obtained suggest that the decrease in serum concentrations is due to enhanced biliary excretion; no significant change was observed in the amount of antibiotic excreted in the urine. The increased capacity of the liver to excrete rifampicin in bile might result from enzyme induction by the antibiotic in hepatocytes.
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  • 4
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    Biochemical genetics 12 (1974), S. 69-79 
    ISSN: 1573-4927
    Keywords: l-glycerol 3-phosphate dehydrogenase, purified ; inbred mice ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract l-Glycerol 3-phosphate dehydrogenase (E.C. 1.1.1.8) was purified from the muscle of BALB/cJ and C57BL/6J mice. The half-lives of the enzyme at 50 C were 6 and 33 min, respectively, for the BALB/cJ and C57BL/6J strains. Enzyme preparations from the two strains of mice were compared with respect to the following properties and found to be essentially indistinguishable: K m values for dihydroxyacetone phosphate, NADH, l-α-glycerophosphate, and NAD+; maximum velocity; competitive inhibition by inorganic phosphate; pH optimum; energy of activation; electrophoretic mobility; molecular weight and subunit molecular weight. From these data, it is concluded that the kinetic properties of the purified enzyme are not the factors responsible for the differences in activity found in crude homogenates of mouse tissues.
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  • 5
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    Oxidation of metals 8 (1974), S. 379-391 
    ISSN: 1573-4889
    Keywords: oxidation ; sulfidation ; kinetics ; parabolic rate law
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The conditions necessary to determine the oxidation kinetics of metals and alloys are discussed quantitatively, and a new method of calculating the rational rate constants was suggested. It was shown that the size and the shape of a metal sample has an effect on the kinetics of oxidation. Further, it was established that the values of the parabolic rate constants of corrosion, calculated from the empirical Pilling and Bedworth equation, contain a serious systematic error, if changes in the metallic core surface area during the oxidation process are neglected.
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  • 6
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    Biochemical genetics 11 (1974), S. 309-317 
    ISSN: 1573-4927
    Keywords: genetics ; rat ; kinetics ; brain MAO ; serum ChE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract This study was performed in order to delineate differences in kinetic enzyme characteristics of brain monoamine oxidase (MAO) and plasma cholinesterase (ChE) derived from the Walker-Walker (Fawn Hooded, FH) rat and from its putative ancestors, the Wistar (W) and Long-Evans (LE). As compared with the enzyme isolated from the other two strains, brain MAO from FH has both a higher V max and increased reaction rate at lower substrate concentrations. It may thus be described as a “more efficient” enzyme. This study confirms previous work which shows that plasma ChE activity of females is higher than that of males. Fluoride ion is a noncompetitive inhibitor of the Wistar ChE, is a competitive inhibitor of the FH enzyme, and has no effect on the LE enzyme. Dibucaine is a competitive inhibitor in all cases except one: ChE derived from the FH female is uncompetitively inhibited. A comparison of the inhibitor constants shows that FH ChE is more resistant to Dibucaine than is that of W, and that LE is the most sensitive. FH cholinesterase is twice as resistant to the action of fluoride as is the Wistar enzyme.
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  • 7
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    Fresenius' Zeitschrift für analytische Chemie 268 (1974), S. 208-208 
    ISSN: 1618-2650
    Keywords: Best. von Gold mit Oxalsäure ; Volumetrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 8
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    Fresenius' Zeitschrift für analytische Chemie 269 (1974), S. 124-125 
    ISSN: 1618-2650
    Keywords: Verwendung von Dihydroxyphenylphthalid und Trihydroxyphenylphthalid als Indicatoren ; Volumetrie ; Argentometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 9
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    Fresenius' Zeitschrift für analytische Chemie 276 (1972), S. 75-76 
    ISSN: 1618-2650
    Keywords: Best. von Stickstoff in Düngemitteln ; Volumetrie ; Reduktion mit Devarda-Legierung, Schwefelsäure-Aufschluß
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 10
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    Fresenius' Zeitschrift für analytische Chemie 276 (1972), S. 80-80 
    ISSN: 1618-2650
    Keywords: Verw. von Diäthazinhydrochlorid als Indicatoren, Redox ; Volumetrie ; Vanadametrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 11
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    Journal of pharmacokinetics and pharmacodynamics 2 (1974), S. 313-335 
    ISSN: 1573-8744
    Keywords: subcutaneous ; absorption ; kinetics ; local anesthetics ; rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The subcutaneous absorption kinetics of a homologous series of local anesthetics and lidocaine were studied under controlled pH conditions using a previously described in vivorat model. All local anesthetics exhibited biexponential absorption profiles suggesting accumulation into a tissue compartment. Evidence supporting this hypothesis was supplied by back-extraction of lidocaine from subcutaneous tissue into an acidic environment, by multiple dosing experiments, and by movement of compound into subcutaneous tissue of a postmortem rat preparation. A series of interanimal relationships were demonstrated between structure and parameters of a twocompartment open model. Particularly striking were the correlations between in vivopartition and tissue clearance and the octanolwater (pH 7.95)partition coefficients.
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  • 12
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    Hydrobiologia 44 (1974), S. 177-207 
    ISSN: 1573-5117
    Keywords: Impoundment ; reservoir ; physicochemical limnology ; eutrophication ; nitrogen ; phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study was conducted to determine a physicochemical profile of a new deep-storage reservoir and to determine the influence of impoundment and thermal stratification in the reservoir on the physicochemical limnology of the parent river. The presence of thermal stratification from May through November caused the most significant change in water conditions. Of 23 parameters studied, 12 remained unchanged, 10 improved, and 2 deteriorated (Table VI). The greatest downstream changes in water conditions from those upstream from the reservoir were a decrease in temperature, an increase of ammonia, and the presence of hydrogen sulfide during the period of thermal stratification. Ammonia did not increase to a level considered to be toxic to aquatic species. It could, however, serve as a nutrient for certain species of plants and result in a change in community structure. Water tempeature downstream from the reservoir was always within the annual temperature range of the river upstream from the reservoir; however, the summer maximum in the tailrace was decreased to a temperature that could interfere wih the normal life cycle of many species.
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  • 13
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    Fresenius' Zeitschrift für analytische Chemie 271 (1974), S. 125-126 
    ISSN: 1618-2650
    Keywords: Best. von Phenol in Abwasser ; Volumetrie ; bromatometr., in Gegenw. von Cyanid u. Thiocyanat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 14
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    Fresenius' Zeitschrift für analytische Chemie 271 (1974), S. 264-269 
    ISSN: 1618-2650
    Keywords: Best. von Eisen ; Volumetrie ; Reduktion mit Ti(III)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird ein Titrationsverfahren beschrieben, das auf der Reduktion des Eisens mit Ti(III) und der potentiometrisch indizierten Folgetitration Ti(III)-Überschuß/Fe(II) mit Cr(VI) basiert. Seine Genauigkeit und Schnelligkeit entsprechen voll denen des derzeit allgemein praktizierten Standardverfahrens. Sein Vorteil diesem gegenüber ist, daß es ohne umweltgefährdende Zusätze auskommt.
    Notes: Abstract A titrimetric procedure on the basis of the reduction of iron with Ti(III) and the potentiometrically indicated consecutive titration of the Ti(III) in excess and the Fe(II) with Cr(VI) is proposed. Its accuracy and speed is in full accordance with the currently used standard method; its advantage, compared with this, is, that it does not need any reagents which are strongly restricted for waste waters.
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  • 15
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    Fresenius' Zeitschrift für analytische Chemie 271 (1974), S. 284-284 
    ISSN: 1618-2650
    Keywords: Verw. von Acetoncyanhydrin als Maskierungsmittel ; Volumetrie ; ÄDTA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 16
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    Fresenius' Zeitschrift für analytische Chemie 271 (1974), S. 368-368 
    ISSN: 1618-2650
    Keywords: Best. von Chrom(III) ; Volumetrie ; Vervielfachung durch Oxydation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 17
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    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 97-101 
    ISSN: 1618-2650
    Keywords: Best. von Kohlenstoff, Wasserstoff in organ Verbindungen ; Volumetrie ; automatisch, sub-mg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary About 200–2000 μg of organic sample is burnt in oxygen. The combustion products are swept over Co3O4 and AgVO3 (650° C) using nitrogen. The nitrogen oxides and the surplus of oxygen are removed by a copper layer (520° C). The water is frozen out and the carbon dioxide is automatically titrated in a solution of Ba(II)ions (0.5 M) and t-butanol (10%) in water using a sodium hydroxide solution (0.075 M) in the same solvent as the titrant. The apparent pH is about 10 in the titration set point. After being evaporised the water is converted into carbon dioxide by means of a mixture of α-naphthylisocyanate (99%) and 1.4-diaza-bicyclo-2.2.2.-octane (1%) at a temperature of about 80°C. The resulting carbon dioxide is titrated in turn. The time of analysis is about 15 min or less. The standard deviations for C and H are 0.18% abs. and 0.05% abs. resp. as a mean.
    Notes: Zusammenfassung Eine Probe von 200–2000 μg wird in Sauerstoff verbrannt. Die Verbrennungsprodukte werden im Stickstoffstrom über CO3O4 und AgVO3 (650° C) geleitet. Der Überschuß an Sauerstoff und Stickoxide werden über Kupfer (520° C) entfernt. Wasser wird während der automatischen Titration von Kohlendioxid in einer Kühlfalle gespeichert. Die Absorptionslösung, in der sofort titriert wird, enthält Ba(II)-Ionen (0,5 M) und t-Butanol (10%) in Wasser. Als Titrationsreagens dient eine 0,075 M Natriumhydroxidlösung in demselben Gemisch von t-Butanol und Wasser. Der scheinbare pH-Wert der Titrationslösung beträgt nach wie vor der Titration etwa 10. Nach beendeter Kohlendioxidtitration wird die Kühlfalle erhitzt und das Wasser wird mit einem Gemisch aus α-Naphthylisocyanat (99%) und 1.4-Diaza-bicyclo-2.2.2.-octan (1%) bei einer Temperatur von 80°C in Kohlendioxid überführt. Das neu gebildete Kohlendioxid wird anschließend in derselben Lösung titriert. Die Analysendauer beträgt 15 min oder weniger. Die Standardabweichungen für C und H betragen im Durchschnitt 0,18% abs. bzw. 0,05% abs.
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  • 18
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    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 126-127 
    ISSN: 1618-2650
    Keywords: Best. von Mangan, Calcium ; Volumetrie ; ÄDTA, neben Mg, Al
    Source: Springer Online Journal Archives 1860-2000
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  • 19
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    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 208-208 
    ISSN: 1618-2650
    Keywords: Best. von Quecksilber, Silber mit Bleiäthylxanthat ; Volumetrie ; Extraktion
    Source: Springer Online Journal Archives 1860-2000
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  • 20
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    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 208-208 
    ISSN: 1618-2650
    Keywords: Best. von Thallium(III) ; Volumetrie ; ferrometrisch
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  • 21
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    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 342-346 
    ISSN: 1618-2650
    Keywords: Best. von Schwefelsäure, Phosphorsäure, Perjodsäure ; Volumetrie ; dilatometr. Endpunkt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Anhand der Neutralisation von H2SO4, H3PO4 und H5JO6 wird gezeigt, daß sich die dilatometrische Indizierung auf die Untersuchung mehrbasischer Säuren anwenden läßt. Bei Vorlagen von 0,5–4 mMol lassen sich mehrere — meist alle — Äquivalenzpunkte mit einem Fehler von 〈0,2% ermitteln. Aus der quantitativen Bestimmung der Reaktionsvolumina in Abhängigkeit von der Konzentration lassen sich Rückschlüsse auf den Reaktionsablauf ziehen.
    Notes: Abstract Dilatometrical indication can be employed to the neutralizing reactions of polybasic acids and is demonstrated by the following acid-base couples: H2SO4/NaOH, H3PO4/NaOH and H5JO6/NaOH. With amounts between 0.5 and 4 mMol several, frequently all, equivalence points can be determined with a deviation of less than 0.2%. The determination of the changes of molar volume of the reactions depending on the concentrations allow conclusions as to the course of the reactions.
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  • 22
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    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 367-367 
    ISSN: 1618-2650
    Keywords: Best. von Zinn(II), Titan(III), Ascorbinsäure mit Chloramin T ; Volumetrie
    Source: Springer Online Journal Archives 1860-2000
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  • 23
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    Fresenius' Zeitschrift für analytische Chemie 268 (1974), S. 31-31 
    ISSN: 1618-2650
    Keywords: Best. von Thorium mit NTA ; Volumetrie
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  • 24
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    Fresenius' Zeitschrift für analytische Chemie 269 (1974), S. 124-124 
    ISSN: 1618-2650
    Keywords: Best. von Isocyaniden ; Volumetrie
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  • 25
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    Fresenius' Zeitschrift für analytische Chemie 262 (1972), S. 29-30 
    ISSN: 1618-2650
    Keywords: Best. von Uran ; Volumetrie ; Dichromat, Ferroin als Indicator
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  • 26
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    Fresenius' Zeitschrift für analytische Chemie 262 (1972), S. 269-273 
    ISSN: 1618-2650
    Keywords: Volumetrie/Katalyse ; Automatisierung von Titrationen mit katalytischer Endpunktsindikation Best. von Jodid mit Quecksilber(II) ; Volumetrie ; katalyt. Endpunkt Best. von Kupfer(II), Mangan(II) mit ÄDTA ; Volumetrie ; katalyt. Endpunkt Best. von Quecksilber(II) ; Silber mit Jodid ; Volumetrie ; katalyt. Endpunkt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung In der vorliegenden Arbeit wird gezeigt, daß sich katalysierte Indicatorreaktionen auch zur Endpunktsermittlung unter Verwendung eines automatischen Titrationsgerätes eignen. Beispiele für photometrische (Mn2+ mit ÄDTA), potentiometrische (Hg2+ und Ag+ mit KJ, J− mit Hg2+) und biamperometrische (Cu2+ mit ÄDTA) Steuerung des Titrationsgerätes illustrieren diese Technik. Dabei werden auch Beispiele beschrieben, bei denen nicht — wie sonst üblich — mit dem Katalysator, sondern mit dem Inhibitor („Titration mit der Bremse“) titriert wird.
    Notes: Abstract The application of automatic titration instruments for volumetric determinations using catalytic indicator reactions is described. Examples for a photometric (Mn2+ with EDTA), potentiometric (Hg2+ and Ag+ with KI, I− with Hg2+) and biamperometric (Cu2+ with EDTA) regulation of the automatic titrator are given. In some of these methods, contrary to the usual way, it is the inhibitor which serves as a titrant (“titration with the brake”) and not the catalyst.
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  • 27
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    Fresenius' Zeitschrift für analytische Chemie 262 (1972), S. 367-368 
    ISSN: 1618-2650
    Keywords: Untersuchung der Oxidierbarkeit von Phenolen und Polyphenolen ; Volumetrie
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  • 28
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    Fresenius' Zeitschrift für analytische Chemie 262 (1972), S. 368-368 
    ISSN: 1618-2650
    Keywords: Best. von Antipyrin ; Volumetrie ; Oxydation mit Hexacyanoferrat(III)
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  • 29
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    Fresenius' Zeitschrift für analytische Chemie 263 (1973), S. 208-208 
    ISSN: 1618-2650
    Keywords: Best. von Nickel neben Kobalt ; Volumetrie ; Hippursäure als Reagens
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  • 30
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    Fresenius' Zeitschrift für analytische Chemie 263 (1973), S. 335-335 
    ISSN: 1618-2650
    Keywords: Best. von Eisen(III) ; Volumetrie ; ÄDTA-Titration, 2,3-Dihydroxynaphthalin als Indicator
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    Fresenius' Zeitschrift für analytische Chemie 264 (1973), S. 348-353 
    ISSN: 1618-2650
    Keywords: Volumetrie ; Endpunktsbestimmung mit Hilfe von Gasblasenladung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A simple theory to account for the reciprocal relationship between concentration of solute and the charge on a droplet ejected as a rising bubble bursts at a solution's surface is proposed. Reasonable agreement is found between theoretical predictions of charge in multivalent electrolytes and the experimental values. Application to continuous analysis of flowing systems and to end-point detection is demonstrated for acidbase and compleximetric titrations.
    Notes: Zusammenfassung Eine Theorie wird vorgestellt, die die reziproke Beziehung zwischen der Konzentration des Gelösten und der Ladung erklärt, die an Tröpfchen entsteht, die beim Platzen aus Flüssigkeiten aufsteigender Gasblasen gebildet werden. Allgemeine Übereinstimmung von Theorie und Experiment wurde für verschiedene mehrwertige Elektrolyte festgestellt. Die Anwendung dieses Prinzips zur kontinuierlichen Analyse fließender Systeme sowie zur Endpunktsbestimmung von Säure-Base- und komplexometrischen Titrationen wird beschrieben.
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    Fresenius' Zeitschrift für analytische Chemie 264 (1973), S. 381-385 
    ISSN: 1618-2650
    Keywords: Acidität ; Steigerung durch Erdalkalisalze in organ. Lösungsmitteln ; Best. von Organ. Säuren ; Volumetrie ; Salzeffekt in organ. Lösungsmitteln
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The acid strength of short-chain carboxylic acids in acetonitrile and acrylonitrile can, by addition of anhydrous alkaline earth perchlorates, be enhanced sufficiently to permit titration of the acid with a tertiary amine in the presence of acid anhydride. This salt effect has been studied by means of potentiometric and automatic thermometric titrations and two distinct mechanisms are thought to be involved: a metathetical reaction at low salt concentrations and a proton desolvation effect at high salt concentrations. High-resolution infra-red spectroscopy has been used to assess the extent of sol vent-cation interaction in acetonitrile. Several equations are used to describe the probable interactions taking place in such salt enhancement phenomena.
    Notes: Zusammenfassung Der Säuregrad von kurzkettigen Carbonsäuren in Acetonitril und Acrylnitril kann durch Hinzufügen von wasserfreien Perchloraten der Erdalkalien genügend gesteigert werden, um bei Vorhandensein von Säureanhydrid eine Titration der. Säure mit einem tertiären Amin zu ermöglichen. Dieser Salzeffekt wurde mit Hilfe von potentiometrischen und automatischen thermometrischen Titrationen untersucht, und es wird angenommen, daß dabei zwei verschiedene Vorgänge eine Rolle spielen: eine Austauschreaktion bei schwachen und ein Desolvatationseffekt bei hohen Salzkonzentrationen. Zur Beurteilung des Ausmaßes der Wechselwirkung zwischen Lösung und Kation in Acetonitril wurde die Infrarot-Spektroskopie mit hoher Auflösung benutzt. Die wahrscheinlich stattfindenden Reaktionsvorgänge werden anhand verschiedener Gleichungen beschrieben.
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  • 33
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    Fresenius' Zeitschrift für analytische Chemie 264 (1973), S. 409-411 
    ISSN: 1618-2650
    Keywords: Best. von Eisen in Blut ; Volumetrie ; ÄDTA ; Sulfosalicylsäure als Indicator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Bedingungen für eine visuelle Mikrotitrationsbestimmung von Eisen mit ÄDTA unter Verwendung von Sulfosalicylsäure als Indicator wurden ermittelt. Das beschriebene Verfahren erlaubt die Bestimmung von 5–500 μg Fe/100 ml und wurde auf Blut angewendet. Der Einfluß von Phosphationen und Perchlorsäure wurde geprüft. Die Methode wurde zur Eichung von Hämometern und in der Gerichtsmedizin eingesetzt. Die Fehler sind 〈 1 %.
    Notes: Abstract Conditions for the visual microtitration of iron with EDTA employing sulphosalicylic acid as indicator have been worked out. The procedure described permits the determination of 5–500 μg Fe/100 ml and has been applied to blood analysis. The effect of phosphate and perchloric acid has been studied. The method was employed for calibration of haemometers and for forensic purposes. Errors are 〈 1%.
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    Fresenius' Zeitschrift für analytische Chemie 265 (1973), S. 31-31 
    ISSN: 1618-2650
    Keywords: Best. von Barium ; Volumetrie ; Cu(II)-ÄDTA-PAR als Indicator, komplexometrisch
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    Topics: Chemistry and Pharmacology
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    Fresenius' Zeitschrift für analytische Chemie 265 (1973), S. 32-32 
    ISSN: 1618-2650
    Keywords: Best von Kupfer(II) mit Eriochromcyanin R ; Volumetrie ; ÄDTA ; Best. von Eisen(III) mit Gallocyanin ; Volumetrie ; ÄDTA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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    Fresenius' Zeitschrift für analytische Chemie 265 (1973), S. 253-256 
    ISSN: 1618-2650
    Keywords: Best. von Kohlendioxid in Wasser ; Volumetrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird die theoretische Fehlerbetrachtung, die Hässelbarth [2] einem neueren Verfahren zur Bestimmung der freien Kohlensäure in natürlichen Wässern [3] gewidmet hat, geprüft und festgestellt, daß er dabei von unzutreffenden Voraussetzungen ausgegangen und daher auch zu unrichtigen Folgerungen gekommen ist. Bei den von ihm durchgeführten praktischen Messungen hat er die Möglichkeiten des Verfahrens nur zu einem Teil ausgeschöpft, woraus sich eine Reihe von ihm bemängelter Differenzen erklären. Daher werden klarstellende Einzelheiten zur praktischen Durchführung des Verfahrens mitgeteilt.
    Notes: Abstract The theoretical examination of errors, untertaken by Hässelbarth [2] on a new method to determine free carbon dioxide in water is investigated and it is found that he had employed wrong bases and arrived at misleading results. In his practical work, he had not considered all the possibilities of the method, which explains a number of differences. Therefore, the practical application of the method is described in detail.
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    Fresenius' Zeitschrift für analytische Chemie 266 (1973), S. 31-31 
    ISSN: 1618-2650
    Keywords: Best. von Uran(IV) ; Volumetrie ; Titration mit Dichromat
    Source: Springer Online Journal Archives 1860-2000
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    Fresenius' Zeitschrift für analytische Chemie 266 (1973), S. 177-186 
    ISSN: 1618-2650
    Keywords: Best. von Eisen, Cer, Dichromat, Kupfer, Nickel ; Volumetrie ; kernmagnet. Relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Quantitative determination of the concentration of paramagnetic ions in aqueous solutions is performed by NMR relaxation titration. By measurement of the nuclear spin-lattice relaxation time T 1 or the nuclear spin-spin relaxation time T2 redox titrations and complexometric determinations of the concentration of paramagnetic ions are possible. Also the precipitation of ions from the solution can be followed by this method. The use of a magnetic indicator in this analytical method is shown. The sensitivity of the method goes down to concentrations as low as 10−3 M. The accuracy of NMR relaxation titration is better than 1%. A number of applications of the method are given.
    Notes: Zusammenfassung Quantitative Bestimmungen von paramagnetischen Ionen in wäßrigen Lösungen können mit Hilfe der kernmagnetischen Relaxationstitration durchgeführt werden. Durch Messung der Kernspin-Gitter-Relaxationszeit T 1 oder der Kernspin-Kernspin-Relaxationszeit T 2 als Funktion der Ionenkonzentration sind Redoxtitrationen oder komplexometrische Titrationen möglich. Der quantitative Ablauf von Fällungen kann ebenfalls verfolgt werden. Die Verwendung von magnetischen Indicatoren bei der Relaxationstitration wird beschrieben. Bestimmungen von Ionenkonzentrationen bis herab zu 10−3 M Lösungen sind z.Z. möglich. Die Methode erlaubt eine Genauigkeit der Konzentrationsbestimmung von 1% und besser. Die Anwendung der Methode wird an einer Reihe von Beispielen gezeigt.
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    Fresenius' Zeitschrift für analytische Chemie 266 (1973), S. 367-368 
    ISSN: 1618-2650
    Keywords: Best. von Halogeniden und Thiohamstoff ; Volumetrie ; Reaktion mit AgNO3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 40
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    Fresenius' Zeitschrift für analytische Chemie 267 (1973), S. 26-28 
    ISSN: 1618-2650
    Keywords: Best. von Bor ; Volumetrie ; Methylboratdestillation, Mannitzusatz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary For the determination of macro amounts of boron several separation methods are known. In this article a version of the well-known methylborate distillation method is described. The determination of the boron is performed by means of titration after addition of mannitol. Experiments show that the described technique can completely compete with other methods.
    Notes: Zusammenfassung Eine Modifikation der Methylboratdestillation wird beschrieben. Die Bestimmung erfolgt volumetrisch nach Mannitzusatz. Die beschriebene Methode ist anderen Verfahren ebenbürtig.
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    Fresenius' Zeitschrift für analytische Chemie 267 (1973), S. 44-44 
    ISSN: 1618-2650
    Keywords: Best. von Thioharnstoffen ; Volumetrie ; manganimetrisch
    Source: Springer Online Journal Archives 1860-2000
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    Fresenius' Zeitschrift für analytische Chemie 269 (1974), S. 368-368 
    ISSN: 1618-2650
    Keywords: Best. von Arsen(III) und Phosphor(III) in Organ. Verbindungen ; Volumetrie
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    Fresenius' Zeitschrift für analytische Chemie 270 (1974), S. 31-31 
    ISSN: 1618-2650
    Keywords: Best. von Diäthyldithiocarbamidat mit ÄDTA ; Volumetrie ; Na-Salz
    Source: Springer Online Journal Archives 1860-2000
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    Fresenius' Zeitschrift für analytische Chemie 270 (1974), S. 104-109 
    ISSN: 1618-2650
    Keywords: Best. von Magnesium, Calcium, Strontium, Barium, Eisen(III) ; Volumetrie ; ÄDTA, dilatometr. Endpunkt.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die bei der Titration von verschiedenen Metallionen mit Titriplex III auftretende Volumenänderung wird mit Hilfe eines Dilatometers kontinuierlich verfolgt und zur Bestimmung des Endpunktes der Reaktion herangezogen. Über einen Anwendungsbereich 0,1〈×〈15 mMol lassen sich die Bestimmungen mit einer Standardabweichung von 〈0,2% reproduzieren. Für die Komplexbildung zwischen Mg2+ und Titriplex III wird die Abhängigkeit der Volumenänderung der Bruttoreaktion von der Konzentration diskutiert.
    Notes: Abstract The changes of the volume which appear during the titration of some metall ions with Titriplex III are continuously controlled by means of a dilatometer and are used for the determination of the end point of the reaction. Over a range of 0.1〈×〈15 mMol all determinations can be reproduced with a standard deviation of 〈0.2%. For the complex formation between Mg2+ and Titriplex III the dependence of the change of volume of the overall reaction on the concentration is discussed.
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    Fresenius' Zeitschrift für analytische Chemie 270 (1974), S. 127-127 
    ISSN: 1618-2650
    Keywords: Best. von Arsentriphenyl, Antimontriphenyl, Wismuttriphenyl mit Chloramin T ; Volumetrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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