The PAL Multiple Headspace Extraction (MHE) Option is a new add-on module to extend the headspace mode of the PAL System COMBI-xt autosampler. In classical headspace technique one sampling is done per vial. The quantitative determination can be inaccurate in the presence of interfering matrices or in cases where a calibration standard cannot be made with the exact same matrix composition. The MHE option consists of a venting tool combined with a Park Station. The MHE technique requires a series of sampling cycles using the same vial. First, a sample is pressurized to a specific pressure. The vial is then sampled and vented. The vial is re-pressurized and sampled again. This process is repeated multiple times to obtain final results.