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  • 1
    Electronic Resource
    Electronic Resource
    Separation of strontium-90 and yttrium-90 by isotopic exchange thin layer chromatography (1967)
    s.l. : American Chemical Society
    Analytical chemistry 39 (1967), S. 1003-1004 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60252a017
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  • 2
    Electronic Resource
    Electronic Resource
    Thin-layer chromatographic behavior of metal ions on ECTEOLA-cellulose in hydrochloric acid media. Selective separation of cadmium (1975)
    Springer
    Chromatographia 8 (1975), S. 669-674 
    Details
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The thin-layer chromatographic behavior of a number of metal ions on ECTEOLA-cellulose has been surveyed in HCl media with and without an organic solvent such as methanol or acetic acid. The addition of a protic solvent to aqueous HCl solution enhances the adsorption of most metal ions tested. Ion-exchange and partition distribution were proposed as the mechanisms controlling the metal ion behavior on ECTEOLA-cellulose in HCl-protic solvent mixtures for the chlorocomplex-forming metal ions and for the other metal ions, respectively. Of the metal ions tested, Cd (II) shows a useful chromatographic distribution in aqueous HCl media, which has allowed the development of a very selective thin-layer chromatographic method for the separation of Cd(II) from other metal ions. Results are presented for the separation of Cd(II) from 38 other metal ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02281029
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  • 3
    Electronic Resource
    Electronic Resource
    Dry-column chromatography of uranium. Application to chemical analysis of monazite and phosphate rock for uranium (1981)
    Springer
    Microchimica acta 76 (1981), S. 57-67 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zur Abtrennung des Urans aus komplizierten Matrices wurde die Trockensäulenchromatographie verwendet. Wie gezeigt werden konnte, lassen sich die Bedingungen der Dünnschichtchromatographie (DSC) auf silanisiertem Silikagel mit Isopropylether-Tetrahydrofuran-Salpetersäure (65∶20∶3) auf das genannte Verfahren übertragen. Chromatogramme sind daher auf trocken geschichteten Säulen mit Lösungsmittelsystemen der DSC herstellbar. Uran wird eluiert und mit Arsenazo III spektrophotometrisch bestimmt. Das Verfahren wurde zur Uranbestimmung in Monazit und Phosphorit erfolgreich angewendet.
    Notes: Summary A dry-column Chromatographic technique has been applied to the separation of uranium from complicated matrices. It has been demonstrated that operating parameters of thin-layer chromatography on silanized silica gel in isopropyl ether-tetrahydrofuran-nitric acid (65∶20∶3) can be transferred to this technique. Chromatograms are thus easily developed on dry packed column with the solvent system of the type used in the TLC. Uranium is eluted off the column and determined with Arsenazo III spectrophotometrically. The technique is successfully applied to the determination of uranium in monazite and phosphate rock samples with good precision and accuracy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197304
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of phosphorus in silicate rocks by flow injection method of analysis (1984)
    Springer
    Microchimica acta 82 (1984), S. 377-383 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein Verfahren zur spektrophotometrischen Phosphorbestimmung in Silikatgestein mittels Fließinjektion wurde entwickelt. Das Gestein wird mit einer Mischung aus Lithiumcarbonat und Borsäure aufgeschlossen und in 1 M Salzsäure gelöst. Ein aliquoter Teil der Lösung wird unmittelbar in das fließende System injiziert, worin Heteropolysäuren aus Molybdän und Antimon gebildet, mit Askorbinsäure reduziert und die Absorbanz der blauen Farbe gemessen wird. Dies ermöglicht die halbautomatische Analyse verschiedener Silikatgesteine zur Phosphorbestimmung. Die Resultate von Standardproben stimmen mit den vorgeschriebenen Werten gut überein. In der Stunde können 20 Proben durchgesetzt werden.
    Notes: Summary A flow injection spectrophotometric method has been developed for the determination of phosphorus in silicate rocks. A rock solution is prepared by fusion with a mixture of lithium carbonate and boric acid and subsequent dissolution with l M hydrochloric acid. An aliquot of the sample solution is injected directly into the flow system, which consists of formation of heteropolyacids of molybdenum and antimony, reduction with ascorbic acid, and subsequent measurement of the absorbance of blue species. It permits semi-automated analysis of a variety of silicate rocks for phosphorus. Results obtained for standard rocks were in good agreement with the recommended values. The throughput comes out 20 samples per h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01198683
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  • 5
    Electronic Resource
    Electronic Resource
    Selective determination of yttrium in geological materials by ion-interaction chromatography (1993)
    Springer
    Microchimica acta 110 (1993), S. 47-53 
    Details
    ISSN: 1436-5073
    Keywords: ion-interaction chromatography ; scandium ; yttrium ; rare earth elements ; glycolic acid ; 1-octanesulfonate ; Arsenazo III
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Selective separation and determination of yttrium in rare earth ores have been achieved by high performance ion-interaction chromatography. Ores are decomposed by sulfuric acid and the rare earths are precipitated in a group as oxalates. Yttrium is then separated from the other rare earths on a C-18 bonded phase silica column modified with 1-octanesulfonate by linear concentration gradient elution for 20 min with 0.15 to 0.40M glycolic acid(pH 3.5). Yttrium elutes at about 10 min between samarium and neodymium, being separated selectively from all the rare earths as well as scandium, thorium and uranium. Post-column reaction detection and quantitation with Arsenazo III [2,7-bis(2-arsonophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic acid] are carried out at 650 nm. Quantitative results are quoted for yttrium in sophisticated, synthetic rare earth mixtures, monazite and xenotime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01243984
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  • 6
    Electronic Resource
    Electronic Resource
    Microchemical determination of lodate and iodide in sea waters by flow injection analysis (1993)
    Springer
    Microchimica acta 110 (1993), S. 71-77 
    Details
    ISSN: 1436-5073
    Keywords: iodate determination ; iodide determination ; sea water ; kinetic spectrophotometry ; flow injection analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A flow injection analysis method for iodate and iodide in sea water is described. The system involves spectrophotometric detection based on the catalytic, fading effect of either iodate or iodide on the indicator reaction of iron (III) thiocyanate and nitrite. With and without an anion-exchange column in the flow conduit, the system allows the determination of iodate and total iodine, respectively; iodide can be found by difference. Both iodate-iodine and total iodine can be determined in the range 0.75 to 150 μg/1 on the sea water basis with analysis times of 20 min for iodate-iodine and 9 min for total iodine. The RSDs are within 1.3% for both iodate and iodide. Results are presented for the determination of iodate and iodide in sea waters and some brines associated with natural methane gas evolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01243987
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  • 7
    Electronic Resource
    Electronic Resource
    Spectrophotometric microanalysis of silicate rocks for manganese after fusion with a lithium carbonate — boric acid mixture (1987)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 326 (1987), S. 156-157 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00468505
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  • 8
    Electronic Resource
    Electronic Resource
    Simultaneous determination of iron(II), iron(III), and titanium(IV) by flow injection analysis using kinetic spectrophotometry with Tiron (1991)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 341 (1991), S. 545-549 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Two flow injection analysis systems have been worked out for the simultaneous determination of Fe(III), Fe(II), and Ti(IV) based on the kinetic spectrophotometry with Tiron. The first system uses a silver reductor column and a single detector with two flow cells aligned in the same optical path to yield two peaks corresponding to (a) Ti(IV)-Tiron and (b) Ti(IV) plus total iron(III)-Tiron complexes. An another sample injection without the silver column yields a single peak which corresponds to Ti(IV) plus Fe(III)-Tiron complexes. With the two sample aliquot injections the system permits simultaneous determinations with throughput of 30 samples/h in the μg to several tens μg range of each species. The second system is a multidetection system with or without the silver reductor column using the same spectrophotometry with Tiron, in which the entrapment of the sample plug into a closed system allows its repetitive passage through a single detector. With the advantage of much simpler instrumentation, the system permits 6 samples/h to be analyzed for the three metal species with somewhat lower precisions than the first system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328493
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  • 9
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of palladium(II) with phenylfluorone in the presence of hexadecylpyridinium bromide (1994)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 349 (1994), S. 523-526 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Phenylfluorone reacts with palladium(II) in the presence of hexadecylpyridinium bromide to form a water-soluble chelate with an absorption maximum at 630 nm, the absorbance being constant in the pH-range of 9.0–10.2. At this wavelength Beer's law is obeyed up to 7.25 × 10−5 mol/L palladium(II). The sensitivity is very high and the molar absorptivity is 8.5 × 104 L mol−1 cm−1, permitting the determination of palladium(II) at µg level. The ratio of palladium to phenylfluorone in the complex is 1:1. The method has successfully been applied to the determination of palladium in titanium alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323986
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of 0.1 to 1000 μ g/ml cadmium in a hydrometallurgical zinc refining process stream by a flow injection technique with computer controlled injection method (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 355 (1996), S. 144-149 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A computer-controlled flow injection system was developed for the determination of cadmium in a hydrometallurgical zinc refining process stream. An anion-exchange method in acidic potassium iodide medium was used for the on-line separation of cadmium from the matrix zinc. 1-(4-Nitrophenyl)-3-(4-phenylazophenyl)triazene (Cadion) was used as the chromogenic reagent for the spectrophotometric detection of cadmium. In order to expand the dynamic range of the flow injection - spectrophotometry, a computer-aided time-based variable-volume injection method has been employed for the introduction of the sample into the flow injection system. Samples ranging from 0.56 to 350 μl can be delivered by controlling the time period of the sample introduction valve and the flow rate of the carrier solution. The system permits a throughput of 5 samples per hour. The reproducibility has been proven to be satisfactory with a relative standard deviation of less than 6.2% (sample injected: 0.56 μl of 850 μg Cd/ml; n=100) and 5.0% (350 μl of 0.14 μg Cd/ml; n=5). The determination limit was 20 μg Cd/ml with 0.56 μl sample injection and 0.05 μg Cd/ml with 350 μl sample injection (the absolute amount of cadmium injected into the system was 11 ng and 17.5 ng, respectively).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663550144
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