2017/11/24 · Two SPME fibers composed of 100 µm polydimethylsiloxane (PDMS), the manual holder, and inlet guide were purchased from Supelco (Bellefonte, PA, USA); SPME vials (20 mL, 7.8 cm in height, 2.3 cm in width) and 20-mm magnetic crimp caps with silicone