SCIENCE|natural and applied sciences|physical sciences|chemistry|analytical chemistry
- sciathcholún Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
- ga
- Guardsäule | Guard-Säule
- de
- Definition Säule, die sich im chromatografischen System vor dem Injektionsventil befindet und eine generelle Filterwirkung ausübt, durch die mechanische Teilchen aus dem Eluens und aus der Apparatur entfernt werden Reference "auf der Grundlage von Eppert Günter J., ""Flüssigchromatographie : HPLC – Theorie und Praxis"", 3. Aufl., Vieweg, Braunschweig, 1997, ISBN 3-528-06770-5, S. 235, http://books.google.at/books?id=i6fuJm-uXwwC (23.08.2010)"
- guard column
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- Definition small column placed between the injector and the analytical column to protect the analytical column from contamination by sample particulates and strongly retained species Reference "COM-EN, based on:The LC Handbook: Guide to LC Columns and Method Development (21.9.2023). Agilent Technologies. 2016."
- Comment "1. The terms ‘precolumn’ and ‘guard column’ are often used interchangeably, but the two types of columns are different and serve separate primary functions. Precolumns are positioned in the HPLC system prior to the sample injector. Their purpose is to saturate the mobile phase with silica so that the silica or bonded silica analytical column packing is not dissolved during use. A guard column is inserted between the injector and analytical column to protect the latter from damage or loss of efficiency due to the presence of particulate matter or strongly adsorbed impurities from analytical samples.2. A guard column and retention gap are essentially the same thing, but they serve different purposes. Retention gaps are used to improve peak shapes for some types of samples, columns, and GC conditions."