Hach DR/700 Procedures Manual page 610

NITROGEN, MONOCHLORAMINE,
Using AccuVacs
1.
Install module
number
61.01
in a DR/700.
Note: The DR/700 must
be calibrated before
sample analysis. See
Calibration following
these steps.
4.
Fill a cell with 10
mL of sample. Cap
the cell. This is the
blank- nothing will be
added to it.
2.
Press:
I/O
The display will show
610 nm
and module number
61.01
After 2 seconds, the
display will show a
program number, the
concentration units
and the zero prompt.
5.
Label one 50-mL
beaker "free
ammonia" and
another 50-mL
beaker
"monochloramine".
Note: Free ammonia is
the ammonia and
ammonium in the
sample, corrected for
monochloramine.
61-54
continued
3.
Press the
key once
PROGRAM
or twice until the
lower display shows
program number
61.000
If necessary, press the
until the
UP ARROW
upper display shows
0.00 mg/l
6.
To test for free
ammonia, add 5
drops of Hypochlorite
Solution into the
beaker labeled free
ammonia.
Note: Occasionally
shake the Hypochlorite
Solution bottle to ensure
proper dispensation.