Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Heavily Loaded Columns in High-Speed Liquid Chromatography (Das Verhalten von Schwerbeladenen Trennsaelen in der Hochdruck-Fluessigchromatographie).
Author Roessler, Gert ; Halasz., Istvan ;
CORP Author Environmental Protection Agency, Research Triangle Park, N.C. Translation Services Section.
Year Published 1974
Report Number EPA-TR-92-75;
Stock Number PB-237 775-T
Additional Subjects Gas chromatography ; Column packings ; Performance evaluation ; Chemical bonds ; Hydrogen bonds ; Translations ; West Germany ;
Library Call Number Additional Info Location Last
NTIS  PB-237 775-T Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 18p
The stability and the lifetime of heavily loaded columns are determined by the pore structure of the support. If linear velocities up to 5-10 cm/sec are wanted the optimum pore diameter should not exceed 500 A. The retentions are influenced by the support if its specific surface area is larger than 10 sq m/g, especially if the samples are capable of hydrogen bonding. This influence can be reduced by chemical modification of the support. Optimum efficiencyis achieved by such supports. Heavily loaded column are well suited for semi-preparative separations, since the maximal sample size is around 10 mg per gram of a stationary liquid phase. Speedy separations can be achieved by flow programming.