Hach DR/700 Procedures Manual page 510

FLUORIDE,
USING ACCUVAC AMPULS
1.
Install module
57.01
in a DR/700.
Note: If samples cannot
be analyzed
immediately, see
Sampling and Storage
following these steps.
4.
Collect at least
40 mL of sample in a
50-mL beaker. Fill a
second beaker with at
least 40 mL of
demineralized water.
Note: For proof of
accuracy, use a 1.0 mg/L
fluoride standard
solution (listed under
Optional Reagents) in
place of the sample.
Note: The sample and
demineralized water
should be at the same
o
temperature (±1 C).
continued
2.
Press
I/O
The display will show
575 nm
and module number
57.01
5.
Fill a SPADNS
Fluoride AccuVac
Ampul with sample.
Fill a second
SPADNS Fluoride
AccuVac with the
demineralized water
(the blank).
Note: Keep tip
immersed while the
ampul fills completely.
57-4
3.
After 2 seconds,
the display will show
a program number,
concentration units
and the zero prompt.
If necessary, press the
key until
UP ARROW
the lower display
shows program
number
57.02.1
6.
Quickly invert the
ampuls several times
to mix. Wipe off any
liquid or fingerprints.