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Analysis of GC Data
A common method used to determine the relative amounts of each component of your product is to
first determine the area of each peak by triangulation.
Peak areas are proportional to the quantity of
the material giving rise to the peak, but they are only relative amounts.
Those relative amounts can
then be expressed as simple ratios or as percentages.
Triangulation
:
To determine the areas by triangulation measure the
height
(h) and the
width at
half height
(which is equal to ½ the base, or ½ b) of each peak in the chromatogram
accurately
in
cm
or
mm
(measure to the nearest 0.1 mm). Clearly mark the measurements on the
chromatogram and record them in your observations.
Calculate the area of each peak using A =
(½ b)h.
Also calculate the sum of the areas of all product peaks on the chromatogram. (See
Figure 1 below as an example.)
Percentage:
If three peaks appear in a chromatogram with areas of 42 mm
2
, 125 mm
2
and 84
mm
2
respectively, the relative amounts of the three components could be expressed as
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This note was uploaded on 01/18/2012 for the course CHEMISTRY 308 taught by Professor Jonscaggs during the Fall '11 term at Boise State.
 Fall '11
 JonScaggs
 Organic chemistry

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