Hanna Instruments HI 83099 User Manual

Page 60

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118

• 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

O).

• Press ▲ or ▼ to return to the measurement screen.

INTERFERENCES

Interferences may be caused by:
Ammonium above 10 ppm
Calcium above 10000 ppm as CaCO

Chloride above 12000 ppm
Magnesium above 8000 ppm as CaCO

Sodium above 8000 ppm

Potassium LR

POTASSIUM LOW RANGE

SPECIFICATIONS

Range

0.0 to 20.0 mg/L

Resolution

0.5 mg/L

Accuracy

±3.0 mg/L ±7% of reading at 25 °C

Typical EMC

±0.5 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 132.

MEASUREMENT PROCEDURE

Note: for sample preparation follow the COLORED OR TURBID SAMPLES procedure at page 17.

• Select the

Potassium LR 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 6 drops of HI 93750A-0 Potassium Reagent, replace

the cap and swirl the solution.

• Place the cuvette into the holder and close the lid.

10 mL