Dionex Easion Operator’s Manual
108
Doc. 155028-01 08/20
Regenerant
A dilute acid or base which converts ion exchange sites in the suppressor back to
the form which will suppress the eluent conductivity.
Resin
See
Ion-Exchange Resin
.
Resolution (R)
A measure of the separation between two sample components. It is expressed as
the ratio of the distance between the two peak maxima to the mean value of the
peak width at the baseline.
R = 2(t
2
- t
1
)/(W
2
+ W
1
)
Where: t
1
and t
2
= the retention times of components 1 and 2,
respectively
W
1
and W
1
= the baseline width of peaks 1 and 2,
respectively (measured in the same units as the retention
time)
R is proportional to the square root of efficiency (N). A value of R = 1.5
represents “baseline separation” of the two peaks.
Retention Time
The time from injection to peak maximum; the basis for identification of a species
in chromatographic analysis.
Separator Column
The column used to perform a chromatographic separation; also called analytical
column.
Siemens (S)
Unit of conductance; the reciprocal of the electrical resistance of a solution.
Suppressor
A device used to minimize eluent conductivity and convert sample species to a
common form, thus increasing detection sensitivity.
Temperature Coefficient
The percent of change in the conductivity of a solution with a 1
o
C change in
temperature. Every solution has a characteristic temperature coefficient which is
determined experimentally.
Theoretical Plates (N)
See
Column Efficiency
.
