by
Bellyup » Fri Sep 18, 2020 12:42 am
James_Ball wrote:Bellyup wrote:
Hi, thankyou!
The peak shapes are good, but if i graph peak area against height then i see that the height doesnt increase alongside peak area, it starts to level off while the area keeps increasing
Does the peak have a flat top? If so then it is exceeding the limit of the detector, and with larger areas it is just a little wider peak but not any higher.
If you display the signal on the front of the GC and it goes to maximum and stays there a few seconds before dropping it will definitely indicate an overloaded condition.
Have you tried a higher split ratio to see what it does?
I can see the peak tips on the software, but havent looked on the GC itself, its not flat on the software, ive been trying different split ratios, low splits ie 10:1 result in wide and leaning peaks, higher splits eg 90:1 are straight and narrower, the higher the split the less area i get, so im thinking of going for 40:1, nice shaped peak, still high peak area.
Ive gone up to a oven temp of 130c on the headspace sampler and increased the sample line and transfer line temps too, still seems like theres room to go higher but im hesitant