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• 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.
• Use laboratory coats or aprons to protect skin and clothing
from splashes.
• Wear appropriate 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.
3.2 Using Hydrogen Peroxide
DANGER
Hydrogen peroxide is an explosion hazard.
Use these additional specific safety precautions when using hydrogen
peroxide in the Digesdahl digestion applications:
• Do not mix hydrogen peroxide with any chemical reagents except as
specified in the Hach 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 use hydrogen peroxide in concentrations greater than 50%.
Hydrogen peroxide (30% or 50%) is a powerful oxidant and should never
be stored near flammable materials. Like sulfuric acid, it can cause burns
and eye damage. In case of eye or skin contact, flush eyes and/or skin
with water for 15 minutes. Immediately call a physician.
Hydrogen peroxide is highly corrosive and should be cleaned up with
water if spilled on instruments or a counter top. Read and observe all
warnings on the reagent labels and Material Safety Data Sheets.
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