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  • 1
    Electronic Resource
    Electronic Resource
    Direct determination of Benzo[a]pyrene in oil distillates by on-line two-dimensional HPLC with column switching (1992)
    Springer
    Chromatographia 34 (1992), S. 376-380 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Column switching ; Polycyclic aromatics ; Oil distillates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A selective and sensitive HPLC method for the determination of Benzo[a]pyrene (B[a]p) in oil fractions by means of column switching is described. The diluted oil samples were injected directly onto a silica column with isooctane as eluent. After fast elution of the main part of the sample matrix, the B[a]p containing fraction was transferred on-line to a dinitro-aryl-modified silica column for final separation with isooctane/tetrahydrofuran. A detection limit of 50 ppt B[a]p was found when using fluorescence detection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268371
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Optimization of throughput in preparative column luquid chromatography by column overloading and partial fractionation of the effluent (1985)
    Springer
    Chromatographia 20 (1985), S. 657-663 
    Details
    ISSN: 1612-1112
    Keywords: Preparative column liquid chromatography ; Optimization of throughput ; Column overloading ; Adjustment of fraction collection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The criteria for the optimization of preparative chromatography are sample throughput and product purity. It is shown for column liquid chromatography that the throughput has been maximized for a given purity by column overloading and appropriate fractionation. The size and position of the fraction must be determined by chemical analysis, since overlapping peaks under overloading conditions are usually distorted compared to the peaks of the same amounts of pure compounds. With overloading of the column larger particles can be used as column packings without reduction of the separation effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262687
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Residue analysis by multicolumn liquid chromatography — Herbicides in cereals (1980)
    Springer
    Chromatographia 13 (1980), S. 408-412 
    Details
    ISSN: 1612-1112
    Keywords: Multicolumn liquid chromatography ; Multidimensional chromatography ; Column switching ; Residue analysis ; Herbicides ; Cereals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The application of multicolumn HPLC in the determination of residues of a new herbicide and its main metabolite in green plants, grains and straw of different cereals is demonstrated. The columns are combined on-line by column switching and UV-detection is used. Due to the high separation power of multidimensional liquid chromatography only a simple and fast sample pretreatment is required resulting in a detection limit of 10−8 g/g.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261521
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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