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  • Column liquid chromatography  (3)
  • Ion-exchange chromatography  (3)
  • Aussalzungsmittel, Mischkomplex  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Determination of vanadium, cobalt, copper, zinc, and cadmium in biological materials by a combined anion-exchange-spectrophotometric method (1986)
    Springer
    Chromatographia 21 (1986), S. 12-15 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Anion-exchange ; Biological standard reference materials ; Anion-exchange preconcentration ; Thiocyanate system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A preconcentration technique involving anion-exchange in thiocyanate media has been developed for the determination of traces of bio-significant and biofunctional elements. The procedure is applied to the analyses of NBS standard reference materials as well as environmental reference materials of NIES (The National Institute of Environmental Studies, Japan Environmental Agency). The results are quoted for vanadium, cobalt, copper, zinc, and cadmium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02310587
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reversed-phase chromatgraphic separation of the rare earth elements (1990)
    Springer
    Chromatographia 29 (1990), S. 579-582 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Dynamic ion-exchange ; Rare earth elements ; Lactate complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Chromatographic behaviour of the rare earth elements on C-18 bonded silica reversed-phase material has been investigated in aqueous lactate media. The lactatocomplexes of the rare earths are distributed and fractionated on the bonded silica column by a mobile phase gradient technique in the presence of hydrophobic ions. The effects of the lactate concentration pH, methanol and hydrophobic ion concentrations in the eluents have been investigated in detail to have the best resulution of the adjacent rare earth elements. Port-column reaction with arsenazo(III) is used to detect the separated rare earth lactatocomplexes. This reversed-phase partition system is suited to separate and detect all rare earth elements within 40 min with good reproducibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261226
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ion-exchange chromatography of glycolatocomplexes of rare earths (1991)
    Springer
    Chromatographia 32 (1991), S. 65-68 
    Details
    ISSN: 1612-1112
    Keywords: Ion-exchange chromatography ; Ion-interaction chromatography ; Sc, Y and Lanthanides ; Glycolatocomplexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The ion-exchange behavior of glycolatocomplexes of the rare earths (Sc, Y and lanthanides) with 1-octanesulfonate as the hydrophobic ion has been investigated in aqueous glycolate media. The system is capable of separating adjacent light intra rare earths, La-Ce-Pr-Nd-Y-Sm, and heavy rare earths, Ho-Er-Tm-Yb-Lu-Sc, from each other with good resolution by gradient elution at room temperature. Intermediate rare earths, Dy-Tb-Gd-Eu-Sm, are difficult to separate from each other. The position of Y in the eluate is different from that found with most other eluent systems used for rare earth separations, being between Nd and Sm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262469
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Anion-exchange preconcentration and determination of bismuth in environmental materials (1991)
    Springer
    Chromatographia 32 (1991), S. 583-585 
    Details
    ISSN: 1612-1112
    Keywords: Ion-exchange chromatography ; Anion-exchange ; Bismuth preconcentration ; Environmental materials analysis ; Graphite furnace atomic absorption spectrometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Anion-exchange preconcentration techniques have been developed for traces of bismuth in environmental materials. Biological samples are opened up with a mixture of acids and silicates by fusion with a lithium carbonate-boric acid mixture. Bismuth is then separated from the sample matrices by anion-exchange from (a) oxalic acid-hydrochloric acid solution or (b) magnesium nitrate solution. Selectively adsorbed bismuth is removed from the column and quantified by graphite furnace atomic absorption spectrometry using palladium nitrate as a matrix modifier. Detection limit is 16 pg for 1% absorption. The developed methods were applied to several environmental reference materials for traces of bismuth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02327908
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Extraction and spectrophotometric determination of cobalt as pyridine-azide mixed ligand complex (1979)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 294 (1979), S. 413-413 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Kobalt mit Pyridin und Azid ; Spektralphotometrie ; Aussalzungsmittel, Mischkomplex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00468540
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  • 6
    Electronic Resource
    Electronic Resource
    A selective lon-exchange separation and spectrophotometric determination of traces of copper in silicate rocks (1980)
    Springer
    Chromatographia 13 (1980), S. 40-42 
    Details
    ISSN: 1612-1112
    Keywords: Silicate rock ; Spectrophotometry ; Ion-exchange chromatography ; Copper ; Trace analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A combined cation-exchange separation-spectrophotometric procedure has been worked out for the accurate determination of traces of copper in silicate rocks. Silicates are opened up with sulfuric and hydrofluoric acids. The residue is taken up into a 0.5 M hydrochloric acid −0.05 M oxalic acid −1% hydrogen peroxide solution and loaded on a strongly acidic cation-exchange resin column. Polyvalent ions including ferric ions do not adsorb on the column, while copper (II) retains together with divalent metal ions as well as aluminum (III). Copper (II) can selectively be eluted by a small volume of 0.05 M thiosulfate solution. This fraction is sufficiently pure to allow a direct spectrophotometric determination of copper with Na-DDTC without the addition of tartrate and EDTA as masking agents. Quantitative results are quoted for the determination of copper in international standard rocks of the Geological Survey of Japan (GSJ) and the U.S. Geological Survey (USGS).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02302715
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamic ion-exchange chromatography with post-column reaction detection for the determination of the rare earth elements in monazites (1990)
    Springer
    Chromatographia 30 (1990), S. 263-266 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ion-exchange ; Rare earths ; Monazite analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Separation and determination of lanthanum, cerium, praseodymium, neodymium and samarium in monazites have been achieved by dynamic ion-exchange chromatography. The ore samples are decomposed by sulfuric acid and the rare earths are separated in a group as oxalates. The rare earth elements are then separated from each other on a column of bonded phase silica by gradient elution with 0.05 to 0.5 M lactic acid (pH 3.5) in the presence of 0.01 M sodium 1-octanesulfonate. Post-column reaction with Arsenazo III is used for detection and quantification of the individual rare earth elements. Results are quoted for lanthanum, cerium, praseodymium, neodymium and samarium in monazites. Detection limit is 1 μg ml−1 with a S/N ratio of 3. The separation is complete within 27 min valley to valley resolution. Precision of better than 1% can usually be obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02319704
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