Hanna Instruments HI 83225-01 - Manual (Page 42)

42 Potassium HR
POTASSIUM HIGH RANGE
SPECIFICATIONS
Range 20 to 200 mg/L
Resolution 5 mg/L
Accuracy ±30 mg/L ±7% of reading at 25 °C
Typical EMC Dev. ±5 mg/L
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 57.
MEASUREMENT PROCEDURE
Note: for sample preparation follow the NUTRIENT SOLUTIONS (HR) procedure at page 22.
• Select the
Potassium HR 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