Septa Designed for water sample collection for volatile organic analysis, these certified glass vials are available in the standard 40mL size and feature all the essentials and none of the frills. 3 Aijiren Tech™ I-Chem™ and EP™ Amber VOA Glass Vials with 0.125in. Septa, 40mL, certified, 40mL Vial amber 0.125 in. bonded septum certified . Sampling Instructions for VOC Analysis. Sampling Instructions for VOC Analysis (Volatile Organic Chemical) How to Sample: 1.) The sample must be