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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Stanovení obsahu residuí kofeinu v povrchových vodách metodou HPLC s UV detekcí
 Glosová, Ivana ; Solich, Petr (advisor) ; Chocholoušová Havlíková, Lucie (referee)
The occurence of caffeine residues was investigated in superrficial waters. The aim of this study was to obtain a first overview about contamination of waters from Mondego River and from source fontains near Coimbra city ( Portugal) with caffeine. The samples were preconcentrated by SPE ( Solid Phase Extraction) with Oasis polymeric column procedure and analysed by Liquid Chromatography (LC) with UV detektor ( 280nm). Mobile phase consist of 190 ml acetic acid glacial 100% and 810 ml of LC water (adjusted to pH 3.0 with acetate sodium) A total of twelve samples were collected in different site of Mondego River and from fountains near Coimbra city during three month's periods. A total of twelve samples of caffeine were analysed under the conditions described and none of them showed to be contaminated with caffeine.
Detailed record
Stanovení obsahu residuí kofeinu v povrchových vodách metodou HPLC s UV detekcí
 Glosová, Ivana ; Solich, Petr (advisor) ; Chocholoušová Havlíková, Lucie (referee)
The occurence of caffeine residues was investigated in superrficial waters. The aim of this study was to obtain a first overview about contamination of waters from Mondego River and from source fontains near Coimbra city ( Portugal) with caffeine. The samples were preconcentrated by SPE ( Solid Phase Extraction) with Oasis polymeric column procedure and analysed by Liquid Chromatography (LC) with UV detektor ( 280nm). Mobile phase consist of 190 ml acetic acid glacial 100% and 810 ml of LC water (adjusted to pH 3.0 with acetate sodium) A total of twelve samples were collected in different site of Mondego River and from fountains near Coimbra city during three month's periods. A total of twelve samples of caffeine were analysed under the conditions described and none of them showed to be contaminated with caffeine.
Detailed record

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