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  • Articles: DFG German National Licenses  (5)
  • 1985-1989  (5)
Source
  • Articles: DFG German National Licenses  (5)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 59 (1987), S. 373-376 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 322 (1985), S. 486-490 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A differential pulse-polarographic method has been studied for the determination of vanadium employing the catalytic maximum wave. A well-defined differential pulse polarographic peak is observed in the potential range from −0.2 to −0.7 V vs. SCE for vanadium(V) in 10 mmol 1−1 NaCl containing 10 mmol 1−1 acetic acid, 40 mmol 1−1 pyrocatechol, and 2.5 mmol 1−1 KBrO3. The peak current is very large and proportional to the concentration of vanadium(V) between 1×10−7 and 1×10−6 mol 1−1. The relative standard deviation at 0.5 μmol l−1 vanadium(V) was 2.06% (n=7). This method has been successfully applied to the determination of vanadium in standard materials such as pond sediment.
    Notes: Zusammenfassung Ein gut definierter differentialpuls-polarographischer Peak wurde für Vanadium(V) in 10 mmol/l NaCl-Lösung, die 10 mmol/l Essigsäure, 40 mmol/l Brenzcatechin und 2,5 mmol/l KBrO3 enthielt, beobachtet (Potentialbereich −0,2 bis −0,7 V gegen SCE). Der Peakstrom ist sehr groß und die Vanadiumkonzentration im Bereich von 1×10−7 bis 1×10−6 mol/l proportional. Die relative Standardabweichung betrug 2,06% (n=7) bei 0,5 μmol/l Vanadium(V). Das Verfahren wurde mit gutem Erfolg zur Vanadiumbestimmung in Standardproben (z.B. Teichsediment) eingesetzt.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 323 (1986), S. 464-468 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A differential pulse polarographic method for the determination of iron employing the catalytic maximum wave has been studied. A well-defined differential pulse polarographic peak for iron(III) in Britton-Robinson buffer solution containing 50 μmol/l N-(2-hydroxyethyl) ethylenediamine N,N′,N′-triacetic acid (HEDTA) and 5 mmol/l KBrO3 is observed in the potential range from +0.2 to −0.3 V vs. SCE. The peak current is very large compared to that of the Fe(III)/EDTA complex, being proportional to the concentration of iron(III) between 1.00×10−8 and 3.58×10−6 mol/l under optimum conditions. The relative standard deviations for 3.58×10−7 mol/l and 1.79×10−6 mol/l iron(III) were 1.38 and 0.54%, respectively (n=5), and the calculated detection limit was 5.2×10−9 mol/l iron(III). The method has been applied to the determination of iron in fresh snow and rain waters.
    Notes: Zusammenfassung Das Verfahren beruht auf der Tatsache, daß in Britton-Robinson-Puffer (mit 50 μmol/l HEDTA und 5 mmol/l KBrO3) im Potentialbereich von +0,2 bis −0,3 V gegen SKE ein gut definierter puls-polarographischer Peak für Eisen(III) auftritt. Der Peakstrom ist im Vergleich zu dem des Fe(III)/EDTA-Komplexes sehr groß und ist unter optimalen Bedingungen im Konzentrationsbereich von 1,00·10−8 bis 3,58·10−6 mol/l der Eisen(III)-Konzentration proportional. Die relative Standardabweichung beträgt 1,38% bzw. 0,54% (n=5) für 3,58·10−7 mol/l bzw. 1,79·10−6 mol/l Fe(III). Die berechnete Nachweisgrenze liegt bei 5,2·10−9 mol/l Fe(III). Das Verfahren wurde zur Eisenbestimmung in Schnee- und Regenwasser eingesetzt.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 326 (1987), S. 214-217 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The evaluation of dispersion in a FIA system, which is one of the indices of analytical sensitivity and separation, has been studied with an electrochemical detector and personal computer. Two different modes are applied to evaluate the degree of dispersion. One is a flat portion type mode, the other a hanging bell type mode. From these experiments it is possible to easily estimate the degree of dispersion in a FIA system concerning low dispersion (1 〈 D 〈 3) and medium dispersion (3 〈 D 〈 10), as discussed by Ruzicka and Hansen. Two regulation methods for sample volume in a FIA system are also discussed.
    Notes: Zusammenfassung Die Dispersion in einem Fließinjektionssystem, die für die analytische Empfindlichkeit und Trennung von Bedeutung ist, wurde nach zwei verschiedenen Methoden ausgewertet. Es ergab sich, daß der Dispersionsgrad im niederen (1 〈 D 〈 3) und mittleren Bereich (3 〈 D 〈 10) (entsprechend den Untersuchungen von Ruzicka und Hansen) leicht berechnet werden kann. Zwei verschiedene Regulierungsmethoden für das Probevolumen in einem FIA-System werden ebenfalls diskutiert.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 333 (1989), S. 19-22 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An electrochemical method for the specific determination of citric acid in sports drink and plaster using citrate lyase and oxaloacetate decarboxylase has been studied. The technique is reasonably rapid and simple to perform. Results from recovery experiments are excellent, i.e. recovery is 99.7±3.0% at a confidence limit of 95% (n=3), and reproducibility (R.S.D.) at 20 μmol/l citric acid is 1.46% (n=3). The method can possibly be used for monitoring citric acid in clinical and food-processing samples.
    Type of Medium: Electronic Resource
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