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111
Potassium MR
POTASSIUM MEDIUM RANGE
SPECIFICATIONS
Range
10 to 100 mg/L
Resolution
2.5 mg/L
Accuracy
±15 mg/L ±7% of reading
Typical EMC
±2.5 mg/L
Deviation
Light Source
Tungsten lamp with narrow band interference filter @ 610 nm
Method
Adaptation of the Turbidimetric Tetraphenylborate method. The reaction between
Potassium and reagents causes turbidity in the sample.
REQUIRED REAGENTS
Code
Description
Quantity
HI 93750A-0
Potassium Reagent
6 drops
HI 93750B-0
Powder Reagent
1 packet
REAGENT SETS
HI 93750-01
Reagents for 100 tests
HI 93750-03
Reagents for 300 tests
For other accessories see page 128.
MEASUREMENT PROCEDURE
Note: for sample preparation follow the NUTRIENTS SOLUTION (MR) procedure at page 18.
• Select the
Potassium MR method using the procedure
described in the
Method Selection section (see page 12).
• Fill the cuvette with 10 mL of sample, up to the mark.
• Add six drops of HI 93750A-0, replace the cap and swirl
the solution.
• Place the cuvette into the holder and close the lid.
10 mL
x 6
Potassium HR
POTASSIUM ULTRA HIGH RANGE
For samples containing more than 200 ppm of Potassium: follow the sample preparation procedure
described at page 19 for NUTRIENTS SOLUTION (HR). Then add to the graduated cylinder 20 mL of the
prepared sample (for HR) and fill the cylinder with demineralized water from the Demineralizer Bottle up
to the 100 mL mark.
Follow the MEASUREMENT PROCEDURE at page 108.
Read the result in mg/L of Potassium on the display and multiply the reading by 5 to obtain the actual
concentration of Potassium.
INTERFERENCES
Interferences may be caused by:
Ammonium above 10 ppm
Calcium above 10000 ppm as CaCO
3
Chloride above 12000 ppm
Magnesium above 8000 ppm as CaCO
3
Sodium above 8000 ppm
