I am using a Micro-GC/TCD (CP 2002P - Varian Inc.) to quantify VOC on gas samples.
I am having a problem getting replicates of one sample to have similar compound concentration. The concentration increase at 5 first runs and are influenced by the position and pressure on sample bag. The same sample bag is being used and the replicates are performed one after another.
Anyone use this equipment and/or got any ideas?