Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Einflußfaktoren auf die Strömungsgeschwindigkeit in chromatographischen Trennsäulen (1981)
    Springer
    Chromatographia 14 (1981), S. 547-553 
    Details
    ISSN: 1612-1112
    Keywords: Flow rate ; Packed columns ; Open tubular columns ; Chromatographic permeability ; Column resistance factor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird gezeigt, daß in der Chromatographie die Strömung fast durchweg laminaren Charakter hat. Ausgehend von der Darcy-Gleichung werden sowohl für Gas-Chromatographische Trennsäulen als auch für Flüssig-Chromatographische Trennsäulen Ansätze für die Strömungsgeschwindigkeit entwickelt. Konzepte für die spezifische Permeabilität, die chromatographische Permeabilität und den Säulen-Widerstandsfaktor werden sowohl für gepackte- als auch für Kapillarsäulen diskutiert. Die experimentelle Bestimmung der oben genannten Einflußgrößen wird gezeigt. Der Einfluß der Form und des Porenvolumens poröser und nichtporöser Trägermaterialien auf den Säulen-Widerstandsfaktor und auf die chromatographische Permeabilität werden besprochen.
    Notes: Summary It is shown that the flow in chromatography is nearly always laminar in nature. Starting from the Darcy equation, expressions are given for the flow rate in both gas and liquid chromatography columns. The concepts of specific permeability, chromatographic permeability and column resistance factor are discussed for packed as well as open tubular columns. The experimental determination of all these factors is demonstrated. The influence of the shape and pore volume of porous and non-porous supports on the column resistance factor and the chromatographic permeability is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265637
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Factors determining flow rate in chromatographic columns (1981)
    Springer
    Chromatographia 14 (1981), S. 439-444 
    Details
    ISSN: 1612-1112
    Keywords: Flow rate ; Packed columns ; Open tubular columns ; Chromatographic permeability ; Column resistance factor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary It is shown that the flow in chromatography is nearly always laminar in nature. Starting from the Darcy equation, expressions are given for the flow rate in both gas and liquid chromatography columns. The concepts of specific permeability, chromatographic permeability and column resistance factor are discussed for packed as well as open tubular columns. The experimental determination of all these factoers is demonstrated. The influence of the shape and pore volume of porous and non-porous supports on the column resistance factor and the chromatographic permeability is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262882
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Increased speed of steroid analysis by capillary GC and GC-MS; effects of sample pretreatment and sample introdution (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 414-422 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; Steroid analysis ; Sample pretreatment ; Sample introduction ; Separation speed ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Quantitative analysis of steroids and their metabolites in urine samples calls for increased speed of sample clean-up, of the derivatization procedure, and of separation. A fast procedure for sample pretreatment, which can be performed within 8 hours, is introduced and evaluated. It is shown that use of fast pretreatment in combination with narrow bore columns, which are compatible with existing instrumentation, can considerably increase, laboratory throughput. The effect of different sample introduction techniques (e.g. splitless, on-column, and moving needle) on column efficiency and resolution is demonstrated and discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240070713
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...