21
•
After the desired program number appears on the secondary display,
follow the measurement procedure described in the related chapter.
•
Select a new parameter measurement procedure by pressing the
PROGRAM
t
and PROGRAM
s
keys.
Note
:
in the following measurement
sections, a generic "P– –" will be placed
on the secondary LCD instead of the exact
related message (e.g. "P2" for Ammonia
HR).
•
Before performing a test read carefully all the instructions related
to the selected parameter.
60
•
Preheat the Hanna Reactor C 9800 to 150 °C (302°F). For correct
use of the reactor follow Reactor Instruction Manual.
Use of the optional HI 740217 safety shield is strongly recommended.
Do not use an oven or microwave because leaking samples can
generate a corrosive and possibly explosive atmosphere.
• Remove the cap from a Reagent Vial.
• Add exactly 5.0 mL of sample to the
vial, while keeping the vial at a 45-
degree angle.
• Replace the cap and mix by inverting
the vial a couple of times.
•
Insert the vial into the reactor and
heat it for 30 minutes at 150°C.
•
At the end of the digestion place the
vials carefully in the test tube rack and
allow to cool to room temperature.
Warning
: as the vials are still hot, be
careful in handling them.
• Select the program number
corresponding to Acid Hydrolyzable
Phosphorus on the secondary LCD by
pressing PROGRAM
t
and
s
.
•
Remove the cap from the vial and
add exactly 2.0 mL of Sodium
Hydroxide (NaOH) Solution 1,20 N,
while keeping the vial at a 45-degree
angle.
• Replace the cap tightly and mix by
inverting the vial a couple of times.
This is the blank.
Phosphorus, Acid Hydrolyzable