Hach DR/700 Procedures Manual page 679

PHOSPHONATES
For water, wastewater and seawater
Persulfate UV Oxidation Method*
1.
Install module
number
81.01
in a DR/700.
Note: If samples cannot
be analyzed
immediately, see
Sampling and Storage
following these steps.
*Adapted from Blystone, P.; Larson, P. A., Rapid Method for Analysis of Phosphonate
Compounds, International Water Conference, Pittsburgh, PA, October 1981
(0-2.5 to 0-125 mg/L)
2.
Press:
I/O
The display will show
810 nm
and module number
81.01
81-5
Method 8007
3.
After 2 seconds,
the display will show
a program number,
the concentration
units and the zero
prompt. If necessary,
press the
UP ARROW
key until the lower
display shows
program number
81.01.1