Hach DR/700 Procedures Manual page 600

NITROGEN, AMMONIA,
3 minutes
7.
Wait 3 minutes.
10.
Place the blank in
the cell holder.
Note: Typical indoor
lighting permits the
DR/700 to operate with
the cell compartment
cover open. In bright
sunlight it may be
necessary to close the
cell compartment cover.
Transfer 10 mL of the
blank solution to a
10-mL cell. If the 10-mL
cell is used for the blank,
another 10-mL cell must
be used for the sample.
continued
8.
Add the contents
of one Alkaline
Cyanurate Reagent
Powder Pillow to
each cell. Cap and
invert the cells several
times to mix.
Note: A green color will
develop if ammonia
nitrogen is present.
11.
Press:
ZERO
The display will
count down to 0.
Then the display will
show 0.00 mg/L and
the zero prompt will
turn off.
61-44
15 minutes
9.
Wait 15 minutes.
12.
Place the
prepared sample in the
cell holder.
Note: Typical indoor
lighting permits the
DR/700 to operate with
the cell compartment
cover open. In bright
sunlight it may be
necessary to close the
cell compartment cover.
Transfer 10 mL of the
blank solution to a
10-mL cell. If the 10-mL
cell is used for the blank,
another 10-mL cell must
be used for the sample.