Hanna-instruments HI 83200 Manual do Utilizador descarregar pdf (Página 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 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 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 s or t to access the second level functions.

• Press the Chem Frm key to convert the result in mg/L of phosphate (PO

¯) and phosphorus pentoxide

• Press s or t 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

Magnesium above 40000 mg/L as CaCO

Ferrous iron above 100 mg/L

10 mL

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