Understanding Your Agilent ChemStation 77
Integration
4
Definition of Terms
Definition of Terms
Cardinal Points
Figure 5 Cardinal points
Cardinal points are the points chosen by the integrator to define and quantify
a peak. Baseline points, valley points, peak apex, and points of inflection are
designated cardinal points and saved. Each cardinal point has a horizontal
coordinate of elapsed time, a vertical coordinate of height from the baseline,
and other parameters, such as peak type, separation codes, start/end values of
potential peaks, and corresponding height, area and slope readings, that the
integrator uses to calculate the peak areas.
Solvent Peak
The solvent peak, which is generally a very large peak of no analytical
importance, is not normally integrated. However, when small peaks of
analytical interest elute close to the solvent peak, for example, on the tail of
the solvent peak, special integration conditions can be set up to calculate their
areas corrected for the contribution of the solvent peak tail.
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