DR/2400
Potassium
Potassium_PP_Other_TPB_Eng_Ody.fm Page 1 of 6
• Program # 905 has a calibration curve for potassium; however, due to potential variation between lots of Potassium 3 Reagent,
perform a new calibration for each lot of reagent to obtain best accuracy. Prepare and store the calibration as directed under
Calibration on page 3.
• Some variations of the calibration procedure are possible. See the Instrument Manual for details.
• Filter highly colored or turbid samples before analysis.
• Wipe the outside of sample cells before each insertion into the instrument cell holder. Use a damp towel followed by a dry one to
remove fingerprints or other marks.
• The final samples are highly acidic. Neutralize to pH 6–9 and flush to drain for disposal. For more information on pollution
prevention and waste management, refer to Waste Management and Safety on page 55.
• After the test, clean the cells with soap and a brush.
Potassium
Method 8049
Tetraphenylborate Method
Powder Pillows
(0.1 to 7.0 mg/L)
Scope and Application: For water, wastewater, and seawater
1. Touch
User Program.
Select the stored program
number for potassium.
Touch
Start.
Note: When performing this
procedure for the first time the
instrument must be
programmed. See User
Programming on page 4.
2. Fill a graduated
mixing cylinder with
25 mL of sample.
3. Add the contents of
one Potassium 1 Reagent
Pillow. Add the contents
of one Potassium 2
Reagent Pillow. Stopper
and invert several times
to mix.
4. Add the contents of
one Potassium 3 Reagent
Pillow after the solution
clears. Stopper and shake
the solution for 30
seconds.
A white turbidity will
form if potassium is
present.
Tips and Techniques
Powder Pillows Method 8049
User Program
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