Chromatography Forum

Hello. I am new to this forum, so please forgive me if I have posted this question in the wrong place.

I am trying to create a method on GC/FID for detecting n-dodecane in dichloromethane. My problem is that I am getting a huge solvent peak and not a very accurate analyte peak. Right now, I have a 0.1 n-dodecane in DCM sample, He carrier gas, injecting 0.5ul sample, 10psi flow rate, temp starting at 40C, ramped at 10C/min to a max of 225C.

Is there a way to adjust the method so the solvent peak is smaller, or just start reporting after the solvent comes off the column so that I don't have a giant peak at the beginning of my run that dwarfs everything else?

Thank you in advance for any advice you can give me (even if it's post this thread in a different place)

-Kyle

Increase split ratio , use a larger diameter inlet liner , and more head-pressure as a starter.

Does your chromatography data system allow a solvent delay? It should allow you to start data collection at a specified time after the run start.

kylebenton,

Splitless or split or modified packed? What kind of column (especially dimensions - usually a plate on the column itself)? 0.1 what for concentration? What kind of data system are you using?

Best regards,

AICMM