the sample vial (10mL of sample added with 0.5 g of NaCl) inserting
it through the septum. Vials were 20 mL of volume, clear with
screw top and hole caps with PTFE/silicone septa 27136 (Supelco,
Bellefonte, PA). The fiber used was conditioned at 250 C for 30 min
in the GC/MS injector before extraction. 150 mL of 1-Heptanol solution
(35 mg/L 1-heptanol in 20% ethanol aqueous solution) was
used as an internal standard.