20 mm headspace vials Crimp caps with septa 20 mm crimper HS-GC/FID, HS-GC/MS, ChemStation software, compatible computer, and printer 8.2.4 Reagents and Standards Reference standards (as needed) 0.01667 v/v% n-Propanol (internal standard) Water (H 2 O) 8.2.5 Standard Preparation