Hach DR/850, Procedures Manual, Page: 278 / 460

278
9.
Remove the caps
from 2 AmVer Diluent
Reagent Test ‘N Tubes
for Low Range
Ammonia Nitrogen.
Using a pipet, add 2 mL
of centrifuged sample
into 1 vial. Add 2 mL of
centrifuged blank to the
other vial. Label the
vials appropriately.
Note: Pipet carefully to
avoid disturbing the
sediment.
10.
Using a funnel, add
the contents of one
Ammonia Salicylate
Reagent Powder Pillow
to each vial.
11.
Using a funnel, add
the contents of one
Ammonia Cyanurate
Reagent Powder Pillow
to each vial.
12.
Cap the vials tightly
and shake thoroughly to
dissolve the powder.
Note: A green color will
develop if inorganic
nitrogen is present.
13.
The display will
show: 15:00 TIMER 2
Press:
ENTER
A 15-minute reaction
period will begin.
14.
After the timer
beeps, clean the outside
of the vials with a towel.
Place the blank in the
adapter. Push straight
down on the top of the
vial until it seats solidly
into the adapter. Do not
move the vial from side
to side as this can cause
errors.
Note: Wipe with a damp
cloth and follow with a dry
one to remove fingerprints
and other marks.
15.
Tightly cover the
sample cell with the
instrument cap.
16.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.0 mg/L N
NITROGEN, TOTAL INORGANIC, Test 'N Tube,
continued