| • If the sample goes to dryness, remove it from the heat immediately and cool to room temperature. Never add hydrogen peroxide to a dry sample flask; an explosion could occur. If you are not sure enough sulfuric acid is present in the digestion flask, STOP. Do not add hydrogen peroxide. Begin the digestion again with less sample or more sulfuric acid. • Be sure to keep the heat shield and the Digesdahl's safety shield in place during use. • Always perform digestion behind a safety shield (Cat. No. 50040-00) or in a closed fume hood. • For respiratory protection use a fume hood. • Do not add alcohol, acetone or other organic solvents to the digestion flask before or after digestion. • During digestion, use the heat setting and digestion time specified in the instructions. Do not leave the Digesdahl unattended during use. • When digesting a new substance for the first time, begin with a smaller size and work up to the optimum quantity for digestion. Do not permit the flask to boil to dryness. • Wear appropriate professional shoes to protect feet from spills. Open-toed shoes should not be worn. • Do not use damaged glassware or apparatus. Discard all damaged equipment and replace it. • Allow the Digesdahl to cool naturally (in ambient air). Cold water may cause hot glassware to shatter. |