Apr 02, 2017 · Gas meter or volumetric flow meter (e.g. DryCal DC‐1, from DEHA Haan & Wittmer, 71296 Heimsheim, Germany) Piston pipettes, 100 and 1000 µL (e.g. from Gilson) Screw‐cap vials, sealable, nominal volume 4 mL (amber glass) Autosampler vials, amber glass and sealable, nominal volume 2 mL. Microlitre syringe, 2 µL