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Aromatic in carbon black
Posted: Sat Jan 21, 2006 1:24 am
by laucc
Can anyone provide me some info on how to determine aromatic in carbon black using gc/gc-ms? Thanks in advance.
Posted: Sat Jan 21, 2006 10:37 pm
by Schmitty
PAHs?
-extract with 99.9% toluene
-rotory evap to concentrate
-inject vs. standards (gc ramp 40 to 300C)
Posted: Mon Jan 23, 2006 4:33 am
by laucc
Thanks Schmitty, can you provide a more detail procedure. And what if i need to get the saturated as well? Many thankx
Posted: Mon Jan 23, 2006 6:31 pm
by Schmitty
I haven't analyzed straight-chain saturated hydrocarbons in conjunction with PAHs.
The method I used is proprietary, but it essentially consists of:
-refluxing or soxhleting the carbon black
-filter/separate
-concentrate to a final volume
-inject on GC/MS with reference standards in toluene with a normal temperature program.
You can add the sat hydrocarbons to your standard mix, and see through validation if they are recovered acceptably. I also recommend using the highest purity toluene possible, to avoid interference. I was having problems with a standard at 1ppb with anything other than 99.9% toluene.
Hope this helps.
Posted: Tue Jan 24, 2006 12:47 am
by laucc
Thank you Schmitty
