Headspace gas analysis liquid desorption of headspace volatiles trapped on activated carbon open tubular traps
The liquid desorption of headspace volatiles from Grob-Habich activated carbon open tubular traps with small volumes of solvent and capillary column gas chromatographic analysis of the resulting solutions in an on-column type of procedure, was found to be an excellent alternative to thermal desorption which, in the case of thermally labile compounds, may lead to the formation of artefacts. The influence of the solvent volume and its flow-rate through the traps on the efficiency with which the adsorbed material is desorbed and transported to the capillary column, were investigated. It was found that practically quantitative recovery of trapped terpenes could be achieved with 5 μl of methylene chloride at a flow-rate of 0.5 μl/s. The efficiency of liquid desorption and the simplicity of the on-column liquid desorption technique was illustrated in a headspace gas determination of an imitation fruit drink. © 1987.