Evaluation of a micro-adsorption detector in liquid and gas chromatography

A study was made with the objectives: 1. Evaluation of a micro-adsorption detector for use in liquid chromatography. 2. Evaluation of a micro-adsorption detector for use in gas ch.ranatography. 3. Investigation of the micro-adsorption cell as a tool for screening chromatographic systems, in adsorption studies, and as a micro-calorimeter. The micro-adsorption detector was found to have sufficient sensitivity to detect nanogram quantities of a component in either a liquid or gaseous carrier, and to have a linear dynamic range of 10²-10³. These qualities, combined with the selectivity of the detector indicate its usefulness in both liquid and gas chromatographic operations. The major limitation to its use is the characteristic adsorption/desorption responsive curve, which requires increased column lengths or resolution over other detectors such as the UV detector. In addition a semi-quantitative correlation between MAD response and chromatographic retention times indicates that the detector has significant potential as a screening tool for separation systems. By means of a calibration apparatus the detector response was characterized in terms of heat flux and temperature differential, and heats of absorption were calculated at concentrations of 10⁻⁴- 10⁻⁶ molar. These compared favorably with those literature values which were available close to these concentrations.

Name thesis:degree_name

Ph. D.

Level thesis:degree_level

doctoral

Discipline thesis:degree_discipline

Chemistry

Department dc:contributor.department

Chemistry

Grantor dc:publisher

Virginia Polytechnic Institute and State University

Year dc:date.issued

1971

Author dc:creator

• Stafford, David Todd

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

en

Handle dc:identifier.uri

http://hdl.handle.net/10919/91013

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/91013