Answer to Question #37806 in Physical Chemistry for TONE

Question

dear sir
-in gas chromatography detection limit express in g carbon or other in second:HOW TO CONVERT FOR EXAMPLE 2 x 10-12 g/sec (LOWER DETECTION LIMIT)for FID DETECTOR TO ppm mol or mol HYDROCARBON?
best regards
tone

Answer 1

The mass can be easily converted to moles by dividing the mass to molar mass. Units ppm show the fraction of the discussed compound in the mixture. So if you know the mass of analyzed mixture, you can obtain the minimal ppm value from simple proportion.