Hach DR/700 Procedures Manual page 533

NITRITE, HR
For water and wastewater
Ferrous Sulfate Method*
1.
Install module
57.01
in a DR/700.
Note: If sample cannot
be analyzed immediately,
see Sampling and
Storage, below.
*Adapted from McAlpine, R. and Soule, B., Qualitative Chemical Analysis, New York 476,
575 (1933)
(0 to 150 mg/L NO
2.
Press:
I/O
The display will show
575 nm
and module
57.01
57-27
Method 8153
-
)
2
3.
After 2 seconds,
the display will show
a program number,
concentration units,
decimal position and
the zero prompt. If
necessary, press the
key
UP ARROW
until the lower
display shows
program number
57.06.1