MOP Vol. IX Procedure – P‐1 Volatile Organic Compounds Water. 5.2 Amber glass sample vials or bottles and Teflon lined screw caps or screw caps with Teflon faced silicon septum. Vials should be a minimum of 25 mL and bottles should be 1 L or 1 qt. Wash with phosphate-free detergent, rinse with tap and then distilled water, and dry at 105ºC.