Fig. 2.

Gauze sheath for polydimethylsiloxane (PDMS) tubes in volatile recovery experiments with standard components. In order to evaluate the effect of contact between the polydimethylsiloxane (PDMS) tubes and the tested substrates (and water) on the recovery of applied standard volatiles, PDMS tubes were either placed directly into the matrix or enveloped in 100 μm PEEK™ (polyether ether ketone) gauze, as illustrated in this figure. A stainless steel spring was placed inside the gauze sheath to maintain a constant volume (0.69 cm²). Both ends of the gauze sheath were sealed with steel staple clips