a. Which compound is more volatile? b. If the half-width of the COS peaks is 0.0

Question

a. Which compound is more volatile?

b. If the half-width of the COS peaks is 0.080 minutes, calculate the column efficiency N

c. If the oven temperature is increased, will H2S elute more slowly or more quickly?

8. (10 points) The chromatogram below shows peaks for mobile phase H2S and COS analyzed by capillary gas chromatography. The mobile phase elution time, tm, is 0.35 minutes ASTM D6228 - Sulfur Compounds in Natural Gas & Gaseous Fuels by GC-FPD H2S, 1 ppm cos, 1 ppm Minutes 0.5 1.5 2 Courtesy of Wasson-ECE

Explanation / Answer

(a): The compound that is absorbed first is more volatile. Hence H2S is more volatile.

(b): N = 5.545x(tr / W1/2)2

=> N = 5.545 x (0.35 min / 0.080 min)2  = 106

(c): When we increase temperature, H2S becomes more volatile. Hence it elutes more quickly

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