Fill a vial with the appropriate volume and label the vial. 3. Prepare the Tea Sample. a. Pipette 10 mL of tea into a clean and Dry 50 mL volumetric flask and dilute to the mark with HPLC/CE grade water. b. Filter the sample using the provided filter. c. Rinse the filter by filtering the first 1-2mL of the sample into the waste beaker. d.