Perform the following with each microcentrifuge tube containing sample and acid:
Note: Vortexing the tubes individually reduces the chance of liquid splashing on the underside of the cap. Tubes may be vortexed in the MPC®-S without the magnet strip; however, if the MPC®-S is used, the sample may need to be shaken down to ensure the liquid is at the bottom of the tube prior to separation.