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GENERAL DIGESDAHL DIGESTION,
3-5 minutes
5.
Heat 3-5 minutes.
Do not boil sample
to dryness. If sulfuric
acid is not present after
heating, do not proceed
with Step 6. Discard the
sample if it evaporates to
dryness. Start over and
use a larger volume of
sulfuric acid in Step 2 of
this procedure. Or chose
a smaller sample amount
for digestion.
Note: Some organic
samples may need more
than five minutes for
complete digestion. See
Table 1 on page 22.
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6.
Do not proceed if
sulfuric acid is not
visible in the flask. Add
10 mL of 50% Hydrogen
Peroxide to the charred
sample via the funnel on
the fractionating head.
Note: Visually confirm the
presence of sulfuric acid in
the flask before adding
hydrogen peroxide.
Note: If the digest does not
turn colorless, add
5 mL increments of
peroxide until the digest
becomes clear.
Note: Use long-neck
glassware or a pipet
to transfer the
hydrogen peroxide.
continued
7.
After addition of
hydrogen peroxide is
complete, boil off excess
hydrogen peroxide by
heating for one more
minute. Do not heat
to dryness.
Note: If the sample goes
to dryness, turn off the
Digesdahl and air cool to
room temperature. Add
water to flask before
handling. Repeat the
digestion from the Step 1
using a new sample.
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8.
Take the hot flask off
the heater and allow the
flask to cool. Remove
the fractionating column
from the digestion flask.
Note: Use finger cots to
remove the digestion flask.
Place it on a cooling pad
for at least one minute.
Then remove the column.
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