Hach DR/700 Procedures Manual page 500

NICKEL,
continued
4.
Add 1.0 mL of
PAN Indicator
Solution, 0.3%, to
each cylinder.
Stopper. Invert
several times to mix.
Note: Use the plastic
dropper provided.
7.
Press:
I/O
The display will show
550 nm
and module number
55.01
15 minutes
5.
Wait 15 minutes.
Steps 6 through 8 can
be performed during
this waiting period.
Note: During color
development, the
sample solution color
may vary from
yellowish-orange to
dark red, depending on
the chemical make-up of
the sample. The
demineralized water
blank should be yellow.
8.
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
55.09.1
55-52
6.
Install module
55.01
in a DR/700.
9.
Add the contents
of one EDTA Reagent
Powder Pillow to
each cylinder.
Stopper and shake to
dissolve.