VWR VOA vials for soil-COD Vials Supplier,Manufacture and Factory water samples, a vortex mixer (VWR Mini Vortexer, product. no. 58816-121, or 5.00 g of clean sand/soil into a 40-mL VOA vial. Spike with CVAA and. EPA Vials, Borosilicate Glass, with PTFE/Silicone-Lined – VWR For the collection and storage of water samples.