Clarus 600/680 GC User’s Guide
1-11
pressure is calculated. This is dependent on the capillary control mode and
installed pressure or split control option.
Flow rate – The mass flow of carrier gas or detector gas in milliliters per minute.
Ghost peaks – Peaks that are not due to sample components, for example, peaks
produced by carrier gas impurities, septum, or components from previous
analyses.
Injection port – The hardware through which the sample is introduced to the
column by injection.
Linearity – Quantitatively all detectors will produce a linear response with
respect to solute concentration over a defined range, for example, the Linear
Range.
Liquid phase – The material in the column that causes the components to
separate because of partitioning of the components between the mobile phase
(carrier gas) and the stationary phase (liquid phase).
Lowest limit of detection – The smallest amount of sample that can be detected
by the detector being used. Usually defined as any signal that is as great as two
times the noise level. Also referred to as Minimal Detectable Quantity (MDQ).
Mobile phase – The gas which carries the solute (sample) along and over the
column material. This carrier gas is inert and usually helium, nitrogen, or
hydrogen.
Noise – Background signal fluctuations arising from a detector response. This
response is the result of the column installed, carrier gas purity, electronic
components, etc. The response of any detector is defined by the signal-to-noise
ratio.
Partition Coefficient – The differential solubility of a substance in two different
phases. In the case of gas–liquid chromatography, the sample components reach
an equilibrium between the gas phase (mobile) and the liquid phase (stationary).
Each component has a different partition coefficient thus causing separation in
the column.
Pressure programming – Pressure control through an independent four-step,
three-ramp program for each carrier gas channel.
Resolution – The degree of separation between two peaks.
Retention time – The time interval from the point of injection to the appearance
of the peak maximum, of a component’s signal.
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