Flow inconsistency: the evil twin of column switching--hardware aspects.
J Chromatogr A
; 1216(45): 7721-7, 2009 Nov 06.
Article
in En
| MEDLINE
| ID: mdl-19765715
ABSTRACT
Solvent flow, generated by HPLC pumps is consistent and accurate. This statement, while true for single column (one dimensional) liquid chromatography applications, may not apply to column switching applications. Connection of pumps and/or columns to one flow path may cause substantial pressure changes. Immediate post valve switch pressure differences between pumps can cause backflow where the mobile phase stored at higher pressure will temporary flow into the lower pressure area. A more common side effect of column switching is flow inconsistency during pump pressurization. For the duration of pump pressurization, liquid flow through the column will be smaller than expected since the HPLC column acts like a flow restrictor.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Chromatography, High Pressure Liquid
Language:
En
Journal:
J Chromatogr A
Year:
2009
Type:
Article
Affiliation country:
United States