Hach DR2400 - Page 722

Silica
Silica
Page 2 of 6
Silica_PTRL_ULow_HTB_Eng_Ody.fm
5. Fill two clean 250-mL
Erlenmeyer flasks to
overflowing with sample.
6. Fill a clean 50-mL
plastic graduated
cylinder with sample
from one of the flasks;
then discard the contents.
Repeat three times.
7. Fill the rinsed
cylinder to the 50-mL
mark with sample from
the same flask.
Discard any remaining
sample in the flask.
8. Pour the contents of
the 50-mL cylinder back
into the original flask.
9. Repeat step 6 through
step 8 for the second flask
containing sample.
10. Use the Repipet Jr.
dispenser to add 1.0 mL
of Molybdate 3 Reagent
to each flask. Swirl to
mix.
11. Touch the timer icon.
Touch
OK.
A four-minute reaction
period will begin.
12. When the timer
beeps, use the Repipet Jr.
dispenser to add 1.0 mL
of Citric Acid F Reagent
to each flask. Swirl to
mix.
Repeat
Steps 6—8