Chemistry-PTM-OMA_Modules_1-4

Contamination of Surfaces

• Contaminate surface areas in a random blinded manner with a  volume of the appropriate material that allows even  distribution across the surface without excessive pooling of  liquid • 2.25 mL for 12” x 12” area • 250 µL for 4” x 4” area • 100 µL for 1” x 1” area • Dry overnight (≥16 h) at room temperature – surfaces must be  visibly dry • Swipe surface area with sponge or swab according to the  method.