GAS Chromatography

In GC the _________ is gaseous and non-interactive.

• mobile phase

• stationary phase

• both mobile phase and stationary phase

GC is the only instrument with the sensitivity to detect ________ organic mixtures of low concentrations.

____________ in GC are generally inert gases such as helium, argon, or nitrogen.

• Stationary phase

• Mobile phase

• Detector

The injection port consists of a rubber septum through which a ________ is inserted to inject the sample.

• column

• detector

• syringe needle

• cartridge needle

Split, splitless, on column and spectumless are examples of_______

• injectors

• detector

• column

• flow meter

Temperature programming allows the _______ temperature to increase at a preset rate during the analysis of a sample.

• detector

• column

• oven

• injector

2 main classes of column in GC are ___________ and _________

The most common carrier gases in GC are ______________.

• acetylene, nitrous oxide, air

• hydrogen, nitrogen and helium

• air, nitrogen, acetylene

The thermal-conductivity (TCD) and flame-ionization (FID) are the two most common _________ on gas chromatography.

• ovens

• columns

• detectors

• injectors

The retention index of a sample component is a number, obtained by interpolation (usually logarithmic), relating the adjusted retention volume (time) or the retention factor of the sample component to the adjusted retention volumes (times) of two standards eluted before and after the peak of the sample component.

This definition is for ___________?

• Kovats index

• spiking method