Hach DR/700 - Page 563

61-7
Method 8078
COBALT (0 to 2.00 mg/L)
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.
2. Press: I/O
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. After 2 seconds,
the display will show
a program number,
the concentration
units and the zero
prompt. If necessary,
the
UP ARROW key
until the lower
display shows
program number
61.02.1
*Adapted from Watanbe, H., Talanta, 1974, 21, 295