condition was attained particularly with respect to the olfactometryoutputs. The equilibrium corresponds to that particular odor intensity, which did not change any further. Since the samples for GC–MS could not be analyzed instantaneously after collection, equilibrium was ensured from the odor-intensity scales of the panelists. After sampling, each sorbent tube was placed inside a tightly capped 5.0 ml special tube holder in order to prevent any ambient contamination of the sorbents. These were kept in a freezer until they were processed further for solid phase extraction and solvent desorption of the VOCs.
2.1.2.1. Solid phase extraction–solvent desorption. One of the most
common sampling techniques is the adsorption of VOCs on solid sorbents. Once the analytes are trapped in sorbents, they must be released for analysis. The most common extraction techniques are solvent extraction (SE) and thermal desorption (TD). Solvent extraction allows higher flow rates, longer sorbent beds and larger total-sample volumes than TD [20–22]. Typically carbon disulfide