Ch 32 Gas Chromatography

Question 1

In this chromatography technique, the mobile phase is a gas, and the stationary phase is a liquid that is retained on the surface of an inert solid by adsorption or chemical bonding

Answer 1

Gas-liquid chromatography

Question 2

In this chromatography technique, the mobile phase is a gas, and the stationary phase is a solid that retains the analyte by physical adsorption

Answer 2

Gas-solid chromatography

Question 3

The mobile phase in gas chromatography is called

Answer 3

Carrier gas

Question 3

Is achieved by increasing the column temperature continuously or in steps during elution

Answer 3

Temperature programming

Question 4

This coupled the separation capabilities of chromatography with the qualitative and the quantitative detection capabilities of spectral methods

Answer 4

Hyphenated methods

Question 5

Named the general types of columns in Gas chrom

Answer 5

Packed columns
Capillary columns

Question 6

The most widely used and generally applicable detector for gas chromatography, wherein effluent from the column is directed into a small hydrogen flame

Answer 6

Flame Ionization Detector (FID)

Question 7

Widely used detector for environmental samples due to its selective nature to halogen-containing organic compounds

Answer 7

Electron Capture Detector (ECD)

Question 8

A detector consists of an electrically heated source whose temperature at constant electric power depends on the thermal conductivity of the surrounding gas

Answer 8

Thermal Conductivity Detector (TCD)

Question 9

Most powerful detector for GC that measures the mass-to-charge ration of ions that have been produced from the sample

Answer 9

Mass Spectrometry Detectors

Question 10

Two basic types of capillary column

Answer 10

Well-coated open tubular
Support-coated open tubular

Question 11

Currently the most widely used GC columns

Answer 11

Fused-silica open tubular columns

Question 12

Consists of attaching a monomolecular layer of the stationary phase to the silica surface of the column by a chemical reaction

Answer 12

Bonded Stationary Phase

Question 13

Is accomplished in situ after a column is coated with one of the polymers

Answer 13

Cross-linked Stationary Phase

Question 14

In open tubular columns, a thin layer of the adsorbent is affixed to the inner wall of the capillary, which is called

Answer 14

Porous layer open tubular columns

Question 15

The approach where a portion of eluent from the first column containing the species is switched to a second column for further separation

Answer 15

Heart cutting