Hach DR/700 Procedures Manual page 563

COBALT
For water and wastewater
1-(2-Pyridylazo)-2-Naphthol (PAN) Method*
1.
Install module
61.01
in a DR/700.
Note: If samples cannot
be analyzed
immediately, see
Sampling and Storage
following these steps.
Adjust the pH of stored
samples before analysis.
*Adapted from Watanbe, H., Talanta, 1974, 21, 295
(0 to 2.00 mg/L)
2.
Press:
The display will show
610 nm
and module number
61.01
Note: Total recoverable
cobalt requires a prior
digestion; use one of the
three procedures given
in Digestion (Section 1).
If EDTA is present, use
the vigorous digestion.
3.
I/O
the display will show
a program number,
the concentration
units and the zero
prompt. If necessary,
the
until the lower
display shows
program number
61-7
Method 8078
After 2 seconds,
key
UP ARROW
61.02.1