Hach DR/700 Procedures Manual page 109

NICKEL,
continued
10.
Press:
I/O
The display will show
420 nm
and module number
42.01
11.
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
42.04.1
42-25
12.
Wait for the
layers to separate
(about 5 minutes).
Insert a pea-size
cotton plug into the
delivery tube of the
separatory funnel.
Drain the chloroform
layer into a sample
cell (the prepared
sample). Stopper.