Record Display for the EPA National Library Catalog

RECORD NUMBER: 50 OF 211

OLS Field Name OLS Field Data
Main Title Detector By-Pass Valve.
Author Cranmer., Morris ;
CORP Author National Communicable Disease Center, Perrine, Fla. Pesticides Research Lab.
Year Published 1967
Stock Number PB-275 109
Additional Subjects Gas chromatography ; Gas detectors ; Gas analysis ; Pesticides ; Design criteria ; Performance evaluation ; Chemical analysis ; Reprints
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB-275 109 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 1p
Abstract
Gas chromatographic detection systems are subject to two main sources of interference: solvent elution and liquid phase bleed. Solvent elution, especially with large injection volumes, often produces undesirable tailing, over-loading or fouling of detector, and flame extinguishment. Column liquid phase bleed causes detector and combustion tube contamination which may result in lost sensitivity, anomalous behavior and catalyst poisoning. The described problems would be solved by a system which would vent solvent, shunt column bleed, and maintain continuous detector equilibrium. Dual columns can be connected to a single detector in the usual manner with or without installation of a by-pass valve.