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Answer 1 · 2017-02-08T03:06:48

-I am not a petroleum chemist, but here is my understanding of the procedure-

Step 1

You run a GC-FID on a control sample and measure the total area of all the hydrocarbon peaks.

Step 2

Run your degradation experiment. Then run a GC-FID on the degraded sample and measure the total area of all the hydrocarbon peaks.

Step 3

Calculate the degradation efficiency ( $"DE"$ ) according to the formula:

$"DE" = 100 % - A_"s"/A_"c" × 100 %$

where

$A_"s"$ = total area of peaks in the sample
$A_"c"$ = total area of peaks in the control