Chromatography Forum

Hello.i have problem with my agilent gc.for calibration curve i inject my calibration standards twice.first one goes normally,but second one results high than first.for example first one 0,86. Second one 5.6 .(this calibration standard same concrentration and same vial) WHATS THE PROBLEM COULD BE?

Hello

The problem is that you didn't mention what is higher - peak area or retention time...
I assume it is peak area problem. Check:

1.Sampler - syringe, plunger, washing solvents
2.Inlet - check for leak, septa, split vent line/filter

Regards

Tomasz Kubowicz

It s amount problem

Hello.i have problem with my agilent gc.for calibration curve i inject my calibration standards twice.first one goes normally,but second one results high than first.for example first one 0,86. Second one 5.6 .(this calibration standard same concrentration and same vial) WHATS THE PROBLEM COULD BE?

The problem could be any one of dozens of things. Unless you tell us what you are analysing and the operating parameters of the instrument, you are expecting us to troubleshoot by guessing.

Peter