Hanna Instruments HI 83200 - Manual (Page 53)

104 105 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 ±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 93750 A-0 Potassium Reagent 6 drops
HI 93750 B-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 124.
MEASUREMENT PROCEDURE
Note: for sample preparation follow the CONCENTRATED SAMPLES procedure at page 18.
• 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.
Phosphorus
• Add the content of one packet of HI 93706B-0 Phosphorus
Reagent B (Amino Acid) to the cuvette. Replace the cap
and shake gently until completely dissolved.
• Reinsert the cuvette into the instrument.
• Press Timer and the display will show the countdown prior to the measurement or, alternatively, wait
for 5 minutes and press Read. When the timer ends the meter will perform the reading. The instrument
displays the results in mg/L of phosphorus (P).
• Press ▲ or ▼ to access the second level functions.
• Press the
Chem Frm key to convert the result in mg/L of phosphate (PO
4
3 ¯) and phosphorus pentoxide
(P
2
O
5
).
• Press ▲ or ▼ to return to the measurement screen.
INTERFERENCES
Interference may be caused by:
Sulfide
Chloride above 150000 mg/L
Calcium above 10000 mg/L as CaCO
3
Magnesium above 40000 mg/L as CaCO
3
Ferrous iron above 100 mg/L
10 mL