DETECTOR

Used to detect any component other than the carrier gas .

Uses an air phase and high temperature to measure chlorinated compounds

Measures combustible hydrocarbons and hydrogen.

Uses a radioactive beta particles (electron) source to measure the degree of electron capture.

Uses a photomultiplier tube to detect spectral lines of the compounds as they are burned in a flame

Are sensitive primarily to hydrocarbons, and are more sensitive to them than TCD.

A form of thermionic detector where nitrogen and phosphorus alter the work function on a specially coated bead and a resulting current is measured.

Work by allowing gases to diffuse through a porous membrane to an electrode where it is either chemically oxidized or reduced

Use radiation passing through a known volume of gas; energy from the sensor beam is absorbed at certain wavelengths, depending on the properties of the specific gas.

Two Types of column

Contain a finely divided, inert, solid support material coated with liquid stationary phase.

Three types of capillary column

Is coated with a very fine film of liquid stationary phase.

Is lined with a thin layer of solid support on to which liquid phase is adsorbed.

Are strengthened by a polyimide coating.

Valve types

A two-position (load and inject) valve

two-position valve with four, six, or more ports.

Also called a stream selection valve.

I T HOLDS TWO INLETS AND TWO DETECTORS, up to four valves in a heated box.

Most commonly used capillary column

Packed column length and internal diameter

Capillary column length and internal diameter