Hach DR/700 - Page 600

61-44
NITROGEN, AMMONIA, continued
7. Wait 3 minutes. 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.
9. Wait 15 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.
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.
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.
3 minutes
15 minutes