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  • 1
    Electronic Resource
    Electronic Resource
    Composition, stability, and analytical applications of the cupric chelate of sulfo-dichloro-hydroxy-dimethylfuchson-dicarboxylie acid (1964)
    Springer
    Microchimica acta 52 (1964), S. 605-608 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Stabilität und Zusammensetzung des Kupferkomplexes mit Chromazurol S wurden untersucht. Nach Entfernung von Beryllium, Aluminium, der Lanthanide, Titan, Zirkon, Hafnium, Thor, Uran, Eisen, Palladium, Borat, Carbonat, Oxalat und Zitrat kann Kupfer einfach und empfindlich spektrophotometrisch bestimmt werden.
    Abstract: Résumé On a étudié la stabilité et la composition du complexe que donne le cuivre avec le chromazurol S. Aprés séparation du Be, de l'Al, des lanthanides, de Ti, Zr, Hf, Th, U, Fe, Pd, des borates, carbonates, oxalates et citrates, on peut doser le cuivre par spectrophotométrie, d'une maniére simple et sensible.
    Notes: Summary Stability and composition of the chelate of copper and Chrome Azurol S have been investigated, and suggestions are made for the spectrophotometric determination of copper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01215700
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  • 2
    Electronic Resource
    Electronic Resource
    Sodium alizarin-3-sulphonate as a chromophoric reagent (1963)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 195 (1963), S. 416-423 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zur Bestimmung von Mikromengen Thorium und Molybdän wird ein Verfahren vorgeschlagen, das auf der Bildung einer rotgefärbten, wasserlöslichen Komplexverbindung mit Natriumalizarin-3-sulfonat beruht. Die Zusammensetzung des Komplexes beträgt in beiden Fällen Me∶Reagens=1∶2. Die Absorptionsmaxima liegen bei 520 nm (Th) bzw. bei 470 nm (Mo). Viele Fremdionen verursachen Störungen und müssen vor der Messung entfernt werden. Die Lösung von Thoriumchlorid bzw. Ammoniummolybdat werden mit frisch bereiteter Alizarinrot S-Lösung behandelt; der pH-Wert soll im Bereich 3,2–8,0 für Thorium bzw. 3,5–5,6 (am besten 5,0) für Molybdän liegen. Die Farbintensität wird mit einem photoelektrischen Colorimeter oder einem Spektrophotometer gemessen; sie wird von der Temperatur nicht beeinflußt. Die Bestimmung läßt sich im Bereich 0,23–16,70 ppm Thorium bzw. 0,19–6,9 ppm Molybdän durchführen.
    Notes: Summary A method has been recommended for the determination of thorium and molybdenum when present in micro-quantities, based on the formation of a red coloured water soluble chelate (λ max=520 nm for thorium and λ max=470 nm for molybdenum) of the composition M∶Re=1∶2, with sodium-alizarin-3-sulphonate. A large number of ions, however, interfere and should be removed before measurements are made. The solution of thorium chloride or ammonium molybdate may then be treated with a freshly prepared solution of Alizarin Red S. The pH should be kept within the range 3.2 to 8.0 for thorium, 3.5 to 5.6 (preferably at 5.0) for molybdenum and the colour intensity may be measured with a photoelectric colorimeter or with a spectrophotometer. Temperature has no influence on the colour intensity. Determinations are possible between 0.23 and 16.70 ppm of thorium and 0.19 to 6.9 ppm of molybdenum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00489992
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  • 3
    Electronic Resource
    Electronic Resource
    Sodium alizarin-3-sulphonate as a chromophoric reagent (1961)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 183 (1961), S. 182-187 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird eine Methode zur colorimetrischen Bestimmung von Wolfram(VI) mit Alizarinrot S beschrieben. Die Zusammensetzung des Farbkomplexes ist MeAliz2, das Absorptionsmaximum liegt bei 470 nm. Die Farbreaktion verläuft fast augenblicklich und gehorcht dem Beer'schen Gesetz im Bereich von 0,37–13,3 ppm Wolfram. Der günstigste pH-Bereich liegt zwischen 3,5 und 5,8. Die Temperatur ist ohne Einfluß auf die Farbintensität. Die Empfindlichkeit beträgt 0,037 μg/cm2 (Sandell) bzw. praktisch 0,37 μg/cm2 (Absorption 0,01 Einheiten). Da die meisten Fremdionen stören, müssen sie vor der Bestimmung abgetrennt werden.
    Notes: Summary A method for the colorimetric determination of hexavalent tungsten with Alizarin Red S has been described. The composition of the coloured chelate is MKe2 and the wave length of maximum absorption is 470 nm. The colour reaction is almost instantaneous. The coloured complex conforms to Beer's Law over tungsten concentration of 0.37 to 13.3 ppm. The suitable pH for the measurement is 3.5 to 5.8 and temperature has no effect on the intensity of the colour. The sensitivity is 0.037 μg/cm2 (Sandell) and 0.37 μg/cm2 (practical) based on an absorption of 0.01 unit. The interference of added foreign ions has also been investigated and most of the common ions are found to interfere and should, therefore, be removed before determination of tungsten is made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00462254
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  • 4
    Electronic Resource
    Electronic Resource
    Sodium alizarin-3-sulphonate as a chromophoric reagent. V. Colorimetric Determination of Vanadium (V) (1963)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 20 (1963), S. 225-231 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The formation of a red coloured chelate (λmax 455 mμ) between ammonium vanadate and sodium alizarin-3-sulphonate has been taken advantage of, in the colorimetric determination of pentavalent vanadium on a micro-scale. The colour formation is instantaneous and the colour intensity is constant between 5°C and 70°C and pH 3.5 and 5.8. The system adheres to BEERS Law over a range of 0.10 to 3.67 p. p. m. of vanadium. The sensitivity is 0.051 γ/cm2 (Sandell) and 0.51 γcm2 (Practical) Copper, beryllium, bismuth, iron, aluminum, cerium, uranium, thorium, tungsten, molybdenum, carbonate, borate, citrate, and tartrate interfere in the determination.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19630200502
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  • 5
    Electronic Resource
    Electronic Resource
    Composition and Stability of the Chelate between Aluminium (III) and sulpho-dichloro hydroxy-dimethyl fuchson dicarboxylic acid (trisodium salt) and analytical applications of the reaction (1963)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 20 (1963), S. 70-80 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of sulpho-dichloro hydroxy-dimethyl fuchson dicarboxylic acid (trisodium salt) with aluminium (III) ions in aqueous solution to give a stable violet complex has been studied in detail, regarding the composition and stability of the chelate and its analytical applications. Absorbance as well as electrical conductance measurements have been performed to determine the composition of the chelate which comes out to be 1:1 (metal:chelating agent). The chelate has its maximum absorbance at 545 mμ, and is stable between pH 3.05 and 6.60. The system obeys Beer's Law over a concentration range of 0.013 to 0.980 p. p. m. of aluminium. The value of log K, as calculated by the absorbance data is 4.3 ± 0.1 at pH 4.0 ± 0.2, temperature 30°C and ionic strength 0.2 (KCl). The corresponding free energy change of formation has also been evaluated. The effects of pH, temperature, time and diverse ions on the reaction have been studied and suggestions have been advanced on the possible position of the chelate ring in the complex. A procedure for the colorimetric microdetermination of aluminium has also been suggested.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19630200108
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  • 6
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    Sodium alizarin-3-sulphonate as a chromophoric reagent (1963)
    Springer
    Details
    Publication Date: 1963-11-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 7
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    Sodium alizarin-3-sulphonate as a chromophoric reagent (1961)
    Springer
    Details
    Publication Date: 1961-05-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 8
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    Composition, stability, and analytical applications of the cupric chelate of sulfo-dichloro-hydroxy-dimethylfuchson-dicarboxylie acid (1964)
    Springer
    Details
    Publication Date: 1964-09-01
    Print ISSN: 0026-3672
    Electronic ISSN: 1436-5073
    Topics: Chemistry and Pharmacology
    Published by Springer
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