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  • 1960-1964  (2)
  • 1955-1959  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Potentiometric determination of vanadium in iron and steel containing chromium and tungsten (1964)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 202 (1964), S. 241-250 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Viele Methoden zur Bestimmung von Vanadium in Eisen und Stahl liefern zu hohe Resultate, falls niedrige Vanadiumgehalte in chromhaltigem Material zu bestimmen sind. Es konnte gezeigt werden, daß dieser Fehler verursacht wird durch die Anwesenheit von Phosphorsäure in der Lösung während der Oxydation mit Permanganat, was zu einer Oxydation des dreiwertigen Chroms führt. Es wurde daher ein potentiometrisches Verfahren entwickelt, das auf einer alten Methode von Willard u. Young beruht, wobei statt Phosphorsäure Flußsäure zur Komplexierung des Wolframs verwendet wird. Mit diesem Verfahren können Vanadiumgehalte ab 0.001% in allen Arten von Eisen und Stahl bestimmt werden, ohne daß Trennungen erforderlich sind. Das Verfahren wurde an einer großen Zahl von Standardproben geprüft.
    Notes: Summary Many procedures for the determination of vanadium in iron and steel yield high results with low contents of vanadium in samples containing chromium. This has been shown to be due to the presence of phosphoric acid in the steel solution during the oxidation with permanganate, leading to oxidation of trivalent chromium. A potentiometric procedure has been developed, based on an old method of Willard and Young in which hydrofluoric acid is used to complex tungsten instead of phosphoric acid. This procedure allows the determination of vanadium from 0.001% upwards in any kind of iron or steel without separations. The proposed procedure has been tested with a large number of standard steels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00468113
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The gravimetric determination of nickel with dimethylglyoxime in the presence of copper (1959)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 165 (1959), S. 354-360 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A detailed investigation has been made of the gravimetric determination of nickel with dimethylglyoxime in the presence of copper. Copper interference is eliminated by precipitation in a solution containing tartrate and thiosulphate at a pH of 5.5–6.5. The solubility of the nickel dimethylglyoxime complex has been determined as a function of temperature, pH and alcohol concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00462358
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A study of interferences in the iodometric determination of copper in fluoride medium (1962)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 191 (1962), S. 401-408 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde der Einfluß zahlreicher Elemente auf die jodometrische Kupferbestimmung in fluoridhaltiger Lösung untersucht. Gold, Palladium, Platin und Vanadium stören die Bestimmung. Einige andere Elemente stören nur in einer Wertigkeitsstufe; durch eine einfach durchzuführende Oxydation oder Reduktion läßt sich die Störung beheben. Barium stört nicht, wenn man es zuvor als Sulfat ausfällt. Die Störung durch Calcium und Strontium läßt sich durch Sulfatfällung nur zum Teil vermeiden. In Gegenwart von mehr als 20 mg Aluminium muß die Titration in tartrat- und fluoridhaltiger Lösung bei pH 1,5–2,5 durchgeführt werden. Dieses Verfahren wurde mit gutem Erfolg bei der Kupferbestimmung in Aluminiumlegierungen angewendet.
    Notes: Summary The iodometric determination of copper in fluoride solution has been investigated with regard to interference or non-interference by a large number of elements. Elements that interfere are: gold, palladium, platinum and vanadium. A number of elements interfere in one valency state but not after an easily performed oxidation or reduction. Barium does not interfere if first precipitated as sulphate. The interference of calcium and strontium is only partially eliminated by precipitation as sulphate. In the presence of more than 20 mg of aluminium titration has to be carried out in a tartrate-fluoride solution at a pH between 1.5 and 2.5. This procedure has been applied succesfully to the determination of copper in aluminium alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00488004
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The photometric determination of Copper by extraction as the Diethyldithiocarbamate. Interferences and their Elimination (1956)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 153 (1956), S. 30-38 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Two procedures for the photometric determination of copper as the diethyldithiocarbamate complex have been investigated as to their selectivity. In the first procedure—extraction by chloroform from a citrate solution ofph about 8.5, containing EDTA—the following elements interfere: HgII, Ag, Au, Pt, Pd, Os, SbIII, TeIV, TlIII and Bi. Interference by HgII, Ag, Pd, SbIII, TeIV and TlIII can be prevented by simple measures. In the second procedure—extraction by a solution of lead diethyldithiocarbamate in chloroform from ammoniacal citrate-only Ag, TlIII, Bi and HgII interfere. Interference by the first three elements can be prevented easily, leaving as the only serious interference in this method mercury in amounts above 500 Μg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00463106
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The extraction of ferric chloride with methyl isobutyl ketone and amyl acetate (1958)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 160 (1958), S. 403-409 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The extraction of iron as ferric chloride in 7 M hydrochloric acid by a mixture of (1+1) or (2+1) methyl isobutyl ketone and amyl acetate is quantitative for macro as well as for micro amounts of iron. The distribution ratio is very high (∼ 4000). With these mixtures no emulsification difficulties are encountered as they are with methyl isobutyl ketone alone. The behaviour of 44 elements in this extraction has been investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00468563
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    Paper (German National Licenses)
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