Hach Digesdahl 23130-20 Instrument Manual page 32

Table 1 Digestion Guidelines of Specific Sample Types
Sample
Sample Weight
Type
Plant tissue 0.25 to 0.5 g
Meat & 0.5 g or
Poultry predigestion
Fluid 0.1 to 0.25 g
Fertilizers
Feed & 0.25 g
Forage
Dairy 0.25 to 2.0 g
Cereal 0.25 to 0.5 g
Beverage about 5 g
(pipet into funnel
Sludge <2.5 g wet sludge
<0.5 g dried sludge
Water & not more than 0.5 g
Wastewater solid (mL = 40/C;
C= % solids)
Bath 0.3 to 10 mL
Solutions
Edible Oils 0.25 to 0.5 g
Ion equivalent of 0.25 g
Exchange dry resin
Resins
Soil 0.25 to 0.5 g
Fuels 0.25 to 0.5 g
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Preheat
Vol. of
Time
Acid
(Step 5)
4 mL 4 min.
4 mL or as in 4 min.
predigest
4 mL 4 min.
4 mL 4 min.
4 mL 4 min.
4 mL 4 min.
4 mL 1 min.
4 mL 3-5 min.
3 mL until acid
is refluxing
4 mL 4 min.
4-6 mL 4 min.
10-15 mL 12 min.
6 mL 4 min.
6 mL 4 min.
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Vol. of
Special Instructions
Peroxide
10 mL Use Nitrogen-free paper to
weigh samples.
10 mL —
10 mL Add 0.4 g Kjeldahl Reduction
Powder to flask before adding
sulfuric acid. Place the flask in
an 80 °C oven 15 minutes before
digestion. Use N-free paper to
weigh samples.
10 mL —
10 mL —
10 mL Use Nitrogen-free paper to
weigh samples.
10 mL Preheat acid for 1 minute then
add sample through funnel. Heat
flask for 30 seconds after sample
is in the flask.
10 mL of Heat the diluted digest for 15
increase in 5 minutes and filter.
mL increments
10 mL or Water must evaporate before
increase in 5 acid will reflux. Boiling chips
mL increments required.
10 mL Water must evaporate before
acid will reflux. Boiling chips
required.
5 mL Weigh samples into flake and
immediately record exact weight.
and 5 mL later
20 mL Digest will be clear with particles
on bottom if metal oxides are not
soluble in H
reagia or suitable solvent to
dissolve particles. If particles are
floating, start again using 15 mL
H SO and longer char time.
2 4
10-20 mL —
20 mL Heat the diluted digest for 15
min. and filter. Lower heater
temperature if foaming or
burning occurs.
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SO . Add aqua
2 4