Hach DR/700 Procedures Manual page 213

POTASSIUM
For water, wastewater and seawater
Tetraphenylborate Method*
1.
Fill a graduated
mixing cylinder with
25 mL of sample.
Note: Filter highly
turbid or colored
samples.
Note: If samples cannot
be analyzed
immediately, see
Sampling and Storage
following these steps.
Note: The DR/700 must
be calibrated before
sample analysis. See
Calibration following
these steps.
*User calibration required; range is approximate.
(0 to 8.0 mg/L)
2.
Install module
45.01
in a DR/700.
45-41
Method 8049
3.
Press:
I/O
The display will show
450 nm
and module number
45.01