Hi everyone!
I have brand new PGC Yokogawa 8000 equipped CP-Chirasil-Dex CB Columns with FID detector and Liquid Sample Valve (LSV) set at 170C deg. The problem is GC can’t separate m-Xylene from p-Xylene in low concentrations.
|
Component name |
Concentration, Vol% |
|
|
Sample 1 |
||
|
M-Xylene |
0.221 |
|
|
Ethylbenzene |
0.408 |
|
|
O-Xylene |
0.0516 |
|
|
P-Xylene |
99.052 |
|
Conditions: Columns: CP-Chirasil-Dex CB Columns - 20 meters long, stable temperature set at 55 C deg. during all cycle, carrier gas is N2 and flow set to 2.6 ml/min.
I would be grateful for any help and suggestions!
A few more questions about this type of column:
- How do you think, if I will make a column longer, just for instance - 25 meters instead of 20 will it help?
- Will it helps to change the temperature or carrier gas flow rate?
- The injections of various solvents, such as methanol or acetone, can help or it will destroy the column?
- Why the Ethylbenzene in that composition goes out after the m&p-Xylene?
- What actually could be the main cause of problems for separation of o,m,p- Xylene?
- Can you please advise another type of column that will work under existed configuration with those components and specific ranges?
Best regards,
Efim.
