Hach DR/700 - Page 275

50-25
Method 8039
NITRATE, HR (0 to 30.0 mg/L NO
3
-
-N)
For water, wastewater and seawater*
Cadmium Reduction Method
(Powder Pillows or AccuVac Ampuls)
USING POWDER PILLOWS
1. Install module
number
50.01
in a DR/700.
Note: If sample cannot
be analyzed
immediately, see
Sampling and Storage
following these steps.
Adjust the pH of stored
samples before analysis.
2. Press: I/O
The display will show
500 nm
and module number
50.01
3. After 2 seconds,
the display will show
a program number,
the concentration
units, decimal
position and the zero
prompt. If necessary,
press the
UP ARROW
key until the lower
display shows
program number
50.05.1
*For seawater, a manual calibration is required; see Interferences.