You should focus on volatile or high-boling compounds. If you select volatiles (like benzene) your method is acceptable (did you optimized the split value regarding the concentration of analytes in your sample?).

For high-boiling compounds (even docosane - b.p. approx.370 deg.C) the injector temp. (300 deg.C) is to low - you should use 370+15 => 385 deg.C. Otherwise you will have strong discrimination in split mode (i.e. the same mass of docosane will result in much smaller peak area comapring to benzene). Generally for high-boiling compounds a splitless injection or on-column should be used.

What type of stationary phase you selected for this application?

For first screening you should use a 100% PDMS. You can switch to FID det. and make a Simulated Distilaltion - this will reveal how the boiling point distribution of your sample is changing. You can check this papers:

Article A new procedure for the determination of distillation temper...

Article Research on the separation properties of empty-column gas ch...

Article Size-exclusion chromatography for the determination of the b...

Article Studies of separation performance of silanized silica gel fo...

regards,

G

Thank you Sir. Regards