1. Shake the vial to fully mix the sediment and liquid. 2. Use a pipet to add 1.8 mL of sample to the test vial. 3. Immediately put the cap on the vial. Hold the vial by the cap, over a sink. Shake the vial quickly. The vial gets very hot during mixing. 4. Clean the vial. 2 Oxygen Demand, Chemical, Reactor Digestion TNTplus Method (7–70 mg/L)