Hanna Instruments HI 83200 - Manual (Page 54)

106 107 Potassium HR
POTASSIUM ULTRA HIGH RANGE
For samples containing more than 200 ppm of Potassium: follow the sample preparation procedure
described at page 18 for CONCENTRATED SAMPLES. 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 105.
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
• Press the Zero key. The display will show “-0.0-” when the meter is zeroed and ready for
measurement.
• Remove the cuvette and add the content of one packet of
HI 93750B-0 reagent. Replace the cap and gently mix for
one minute by slowly turning the cuvette upside down.
• Reinsert the cuvette into the instrument.
• Press Timer and the display will show the countdown prior to the measurement or, alternatively, wait
for 2 minutes and press Read. When the timer ends the meter will perform the reading. The instrument
displays the results in mg/L (ppm) of potassium (K).
• Press ▲ or ▼ to access the second level functions.
• Press the
Chem Frm key to convert the result in mg/L of potassium oxide (K
2
O).
• Press ▲ or ▼ to return to the measurement screen.
• For ULTRA HIGH RANGE samples: follow the procedure described at page 107.
Potassium HR