Hach DR/700 Procedures Manual page 296

NITRITE, LR,
USING ACCUVAC AMPULS
1.
Install module
50.01
in a DR/700.
Note: If sample cannot
be analyzed immediately,
see Sampling and
Storage following these
steps.
4.
Fill a cell with 10
mL of the sample (the
blank). Cap. Collect
at least 40 mL of
sample in a 50-mL
beaker.
continued
2.
Press:
I/O
The display will show
500 nm
and module number
50.01
5.
Fill a NitriVer 3
Nitrite AccuVac
Ampul with sample.
Note: Keep the tip
immersed while the
ampul fills completely.
Note: For proof of
accuracy, use a
0.10 mg/L nitrite
nitrogen standard
solution (preparation
given in Accuracy
Check) in place of the
sample.
50-46
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
50.09.1
6.
Invert the ampul
several times to mix.
Wipe off any liquid or
fingerprints.
Note: A pink color will
develop if nitrite
nitrogen is present.