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- Posts: 10
- Joined: Tue May 12, 2020 12:50 pm
I need advice.
I have a problem with the linearity of the curve in the range from 50 to 200 µg. There is no problem with range from 5 to 50 ug.
I have 35 VOCs mix in DMSO.
A calibration curve is only prepared by adding an appropriate amount of standatd mix (DMSO) solution, e.g. 1, 5, 10, 20, 25, 50, 100, 200 µl, And ISTD Toulen-d8 to HS vial.
Response of ISTD is also smaller for higher point.
I suppose the reason could be a larger DMSO volume than the lower points and it's , Am I right?
Do you think that adding 1-2 mL of water can improve resposne ?
HS
Oven: 85*C
Loop: 105*C
Transfer line: 110*C
Time in oven: 35 min.
GC
DB-VRX (60m x 0,25 x 1,4 )
Split 1:40
Inj. 250 *C