Date of Award

Spring 1964

Degree Type

Thesis - Restricted

Degree Name

Master of Science (MS)




A gas chromatographic column at a given temperature can operate at maximum efficiency throughout its entire length at only one carrier gas linear velocity. Therefore; in practice, a column does not operate at maximum efficiency throughout because the pressure difference between inlet and outlet necessary for gas movement causes a gas velocity gradient in the column. This loss of efficiency is usually tolerated, or minimized by using a. thinner liquid coating on the solid support. Generally, but within limits, the thinner the liquid coating the higher the efficiency. However, increasing efficiency in this manner decreases separating power; i.e., the ability to cause a difference in solute band velocities. the object of the work herein described was to determine whether a column in which the concentration of liquid coating, decreased continuously from inlet to outlet so as to compensate for the gas velocity gradient would be highly efficient. Such a column would have an average liquid coating large enough to exhibit high separating power.