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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of chemical & engineering data 8 (1963), S. 405-408 
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 86 (1964), S. 3581-3582 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 187 (1960), S. 259-260 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Seeds of the three varieties were directly sown in pots on June 10, 1959. The lengths of leaf sheath and blade were measured periodically, and this recording was continued up to the harvesting time. The individual length of the leaf sheaths and leaf blades as indicated in the graphs (Figs. 1 and 2) ...
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 48 (1961), S. 669-670 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 49 (1961), S. 361-365 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mononitrosochromotropsäure gibt rosa bis violette Färbungen mit einer großen Zahl von Kationen. Dies läßt sehr empfindliche, aber nicht sehr spezifische Nachweise für Kupfer, Kobalt, Nickel und Palladium zu. Die Komplexe mit Thor, Yttrium, Lanthan und Cer ermöglichen den indirekten Nachweis von 1μg Fluorid.
    Abstract: Résumé L'acide mononitrosochromotropique donne des colorations roses à violettes avec un grand nombre d'ions métalliques; il donne des tests tout à fait sensibles mais qui ne sont pas très spécifiques avec le cuivre, le cobalt, le nickel et le palladium. Les chélates avec le thorium, l'yttrium, le lanthane et le césium permettent de déceler indirectement 1μg d'ion fluorure.
    Notes: Summary Mononitrosochromotropic acid gives pink to violet colorations with a large number of metal ions; it provides quite sensitive, but not very specific tests for copper, cobalt, nickel, and palladium. The chelates with thorium, yttrium, lanthanum, and cerium permit the indirect detection of 1μg of fluoride ion.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 174 (1960), S. 38-44 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 194 (1963), S. 340-346 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der blau gefärbte Thoriumkomplex des Farbstoffes β-SNADNS-6 (hergestellt aus Chromotropsäure und 2-Naphthylamin-6-sulfonsäure) wurde spektrophotometrisch untersucht. Der Komplex, der die Zusammensetzung 1∶1 hat, bildet sich imph-Bereich 2–4, mit maximaler Farbentwicklung zwischenph 2,5 und 3. Das Absorptionsmaximum liegt bei 590 nm, der molare Extinktionskoeffizient beträgt 20604; die Stabilitätskonstante wurde nach verschiedenen Methoden bestimmt und im Mittel zu 1,25 · 105 gefunden.
    Notes: Summary The dye β-SNADNS-6, has been prepared from chromotropic acid and 2-naphthylamine-6-sulfonic acid. The blue thorium complex of this dye has been studied spectrophotometrically. The complex forms in theph range 2 to 4, the maximum colour development occurs at a very narrow ph range of 2.5 to 3. The maximum absorption of the complex occurs at 590 nm. The colour reaction is fairly sensitive. The molar absorption coefficient of the complex is 20,604. The average formation constant of the thorium chelate, determined by various methods, was calculated as 1.25 · 105. Only one complex having the composition 1∶1 is formed.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 202 (1964), S. 332-339 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Möglichkeit der papierchromatographischen Trennung verschiedener Elemente (Th, U, Zr, Fe, Mg, Ni, Co, Ce, La, Y, Sm, Gd) mit tributylphosphathaltigen Laufmitteln ist untersucht worden. Hierbei wurde die Beeinflussung der Rf-Werte durch verschiedene Faktoren geprüft und eine Möglichkeit zur Trennung von Thorium und Uran voneinander sowie von anderen Metallen gefunden. Als Laufmittel hat sich am besten das Gemisch Methylisobutylketon-Isobutanol-Tributylphosphat (50∶38∶12), äquilibriert mit 4 n Salpetersäure, bewährt. Nur U und Th wandern, alle anderen Elemente bleiben auf der Startlinie. Thorium konnte auch aus Monazitextrakt abgetrennt werden. β-SNADNS-6 dient als einziges Nachweisreagens für alle genannten Metalle und wird auch als Indicator benutzt bei der komplexometrischen Titration von Zr, Th und U im Anschluß an die papierchromatographische Abtrennung.
    Notes: Summary The possibility of paper chromatographic separation of a number of elements (Th, U, Zr, Fe, Mg, Ni, Co, Ce, La, Y, Sm, Gd) has been studied, employing solvent mixtures containing tri-n-butyl phosphate (TBP) as principal constituent. Various factors that influence the Rf values have been investigated. It has been made possible to separate only thorium and uranium from the other elements including the rare earths and also from one another. Only thorium and uranium move under the conditions studied, the others remain stationary on the starting line. The solvent mixture methylisobutyl ketone-isobutyl alcohol-TBP (50∶38∶12) shaken with 4 M HNO3 proved to be a good mobile solvent for the separation of thorium and uranium. Thorium has also been separated from monazite extract. A single chromatogenic spray (β-SNADNS-6) has been used for the detection of all the elements. Thorium, uranium and zirconium have also been quantitatively estimated after chromatographic separation by EDTA titration using the same dye.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 184 (1961), S. 177-184 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein Azofarbstoff der Chromotropsäure, DSNADNS, der aus Chromotropsäure und 1-Amino-8-naphthol-3,6-disulfonsäure dargestellt werden kann, ergibt mit Zirkonium in saurer Lösung eine quantitative Fällung. Der blauviolett gefärbte Komplex ist in allen üblichen organischen Lösungsmitteln unlöslich, löst sich jedoch in einigen flüssigen organischen Basen sowie wäßrigen Lösungen von Ammoniumsalzen mit rosa bis violetter Färbung. Die Lösungen des Komplexes in Pyridin, Triäthanolamin sowie in Ammoniumacetat, -oxalat und -carbonatlösungen und ihre analytische Verwendbarkeit werden spektrophotometrisch untersucht. In Pyridin sowie in Ammoniumacetat und -oxalatlösungen scheint sich der Komplex zu zersetzen, während er in Triäthanolamin und Ammoniumcarbonatlösungen ziemlich beständig ist. Das Absorptionsmaximum des Farbstoffs in diesen beiden Lösungsmitteln liegt bei 500 bzw. 520 nm, der Komplex weist in beiden Fällen ein Maximum bei 540 nm auf. Das Beersche Gesetz wird in beiden Lösungsmitteln von 4–25 mg Zr/l erfüllt. Der molare Absorptionskoeffizient beträgt 686 bzw. 823. Die Lösung des Komplexes in Triäthanolamin ist stabiler als in Ammoniumcarbonatlösung. Eine spektrophotometrische Bestimmung von Zirkonium, die nur wenig von Fremdionen gestört wird, könnte daher gut in Triäthanolaminlösung durchgeführt werden.
    Notes: Summary A chromotropic azo dye, DSNADNS, prepared from chromotropic acid and 1-amino-8-naphthol-3,6-disulfonic acid has been found to produce quantitative precipitation of zirconium in acid medium. The blue-violet complex formed is insoluble in all organic solvents commonly used for solvent extraction work, but is soluble in a number of liquid organic bases and solutions of ammonium salts in water showing pink to violet colouration. Spectrophotometric studies as to the nature of the complex in pyridine, triethanolamine ammonium acetate, oxalate and carbonate solutions and the analytical possibility of these solutions have been made. The complex appears to decompose in pyridine, ammonium acetate and ammonium oxalate solutions, but it is fairly stable in ammonium carbonate and triethanolamine solutions. The absorbance peaks of the dye in these solutions occur at 500 and 520 nm respectively, while the complex in triethanolamine and ammonium carbonate both shows absorbance maxima at 540 nm. The solution of the complex in these two solvents obeys Beer's law within a concentration range 4 to 25 mg of zirconium per litre. The molar absorbance coefficients of the complex in triethanolamine and ammonium carbonate are respectively 686 and 823, which indicate poor sensitivity. The solution of the complex in the former solvent is more stable than that in the latter and an analytical procedure for the spectrophotometric determination of zirconium, with little interference from foreign ions, may be developed with ease in the triethanolamine solution.
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  • 10
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 58 (1962), S. 1233-1241 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The incorporation of halogen endgroups in polymers has been established in the following cases for polymerization of styrene, methyl methacrylate and methyl acrylate: (1) chain transfer with halogenated hydrocarbons (chloroform, benzyl chloride, bromoform, ethylene dibromide, octadecyl bromide, ethyl iodide, cetyl iodide); (2) copolymerization with suitable components (vinyl bromide, tetrachloroethylene, trichloroethylene); (3) use of halogen atoms as initiators, e.g. FeCl3 (+hv), FeBr3 (+hv), HCl (+hv) and KBr + H2O2 (+hv); (4) chemical transformation of a group already present in a polymer, e.g., conversion of hydroxyl endgroup to halogen endgroup by a usual method; addition of hydrogen bromide to double bond in polymers. The method of detection consists in converting a polymer with halogen endgroups to a quaternary pyridinium halide by refluxing with pyridine, a few drops of glycerol being added in the case of chlorine endgroup to facilitate the reaction. The converted quaternary halogen endgroup is detected independently by two tests developed in this laboratory: the dyeinteraction test with rhodamine 6GX conc. (Calco) dye and also the dye-partition test for cationic group with Bromophenol Blue or Disulfine Blue VN 150 as reagents.
    Additional Material: 5 Tab.
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