Can I remove more then one sample from an equilibrated headspace vial and achieve accurate and precise results?
When performing quantitative headspace GC analysis it is not recommended that more then one injection be made from a vial. This is especially important when the partition coefficient is low, i.e. when a high percentage of the components of interest are in the gas phase (headspace). An example of that type of headspace sample would be the analysis of benzene, toluene and xylenes (BTX) in water, where almost 100% of these volatile components are in the headspace vapor phase in the sample vial.