User Guide

ManualsBrandsHanna Instruments ManualsMeasuring instrumentsHI 83225

LIST OF MATERIAL

Each instrument HI 83225 is supplied with the following accessories

for sample preparation:

• 4 cuvettes (10 mL);

• 2 plastic beakers (100 and 170 mL);

• 1 graduated cylinder (100 mL);

• 1 syringe with screw rim (60 mL)

• 1 syringe (5 mL);

• 1 filter assembly;

• 25 filter discs;

• 1 spoon;

• 2 pipettes;

• Carbon powder packets (50 pcs);

• 1 Demineralizer Bottle with filter cap for about 12 liters of

deionized water (depending on the hardness level of water to

be treated).

SAMPLE PREPARATION PROCEDURE

Note: If the water sample to be analyzed is very turbid, let it stand in

a beaker for a while until most of the solid particles have

settled. Then, use the pipette to transfer the supernatant solu-

tion to the other beaker and prepare the samples as described

below. During this operation, take care not to induce air bubbles

into the solution, in order not to displace the settled solids at

the bottom of the beaker.

IRRIGATION WATER (LR):

• Measure with the graduated cylinder about 100 mL of

sample.

• If the solution contains

some turbidity or color,

pour it in the large

170mL beaker and

add a powder packet

of active carbon.

SAMPLE PREPARATION

Phosphorus MR

x 10

• Wait for a few seconds and the

display will show "-0.0-". Now

the meter is zeroed and ready for

measurement.

• Remove the cuvet.

• Add 10 drops of HI 93706A

Molybdate reagent.

• Add the content of one packet of

HI 93706B Phosphorus Reagent

B (Amino Acid) to the cuvet.

Replace the cap and shake gently

until dissolution is complete.

• Reinsert the cuvet 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

DIRECT. In both cases "SIP" will blink during measurement.

• The instrument directly displays concentration in mg/L of phosphorus

(P) on the Liquid Crystal Display.

• To convert the reading to mg/L of phosphate (PO

3–

), multiply by

a factor of 3.07.

INTERFERENCES

Calcium above 10000 mg/L as CaCO

Chloride above 150000 mg/L as Cl

–

Ferrous iron above 100 mg/L

Magnesium above 40000 mg/L as CaCO

Sulfide