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•Always wear safety glasses.
•Always perform digestion behind a safety shield or in a closed fume hood.
•If the sample goes to dryness, remove immediately and cool. Repeat
procedure with smaller sample volume or more acid.
The following additional specific safety precautions are appropriate
when using hydrogen peroxide in the Digesdahl digestion applications:
Do not mix hydrogen peroxide with any chemical reagents except as
specified in the instructions.
Do not add hydrogen peroxide directly to the column on the digestion
flask. Always add hydrogen peroxide in a slow and controlled manner;
use the capillary funnel.
Hydrogen peroxide should be added to the organic materials in the flask
only when sulfuric acid is present.
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.
When digesting a new substance for the first time, begin with a smaller
size and work up to the optimum quantity for digestion.
The digestion flask and attached fractionating column must be vented at
all times.
During operation, the Digesdahl heating element and associated
glassware become very hot. Handle this glassware with the provided
finger cots protecting the thumb and index finger. A hot digestion flask
can scorch an unprotected surface. Use the cooling pad. If a flask
should break during a digestion, perform the following procedures to
avoid injury to personnel or damage to equipment:
1. Unplug the heater assembly and wait for the unit to cool.
2. Do not breathe any fumes that may be produced.
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