Hanna-instruments HI 83266 Uživatelský manuál stáhnout pdf (Strana 13)

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Calcium Hardness

CALCIUM HARDNESS

SPECIFICATIONS

Range 0 to 500 mg/L (as CaCO

)

Resolution 5 mg/L

Accuracy ±10 mg/L ±5% of reading at 25 °C

Typical EMC ±5 mg/L

Deviation

Light Source Tungsten lamp with narrow band interference filter @ 525 nm

Method Adaptation of the

Standard Methods for the Examination of Water and Wastewater,

edition,

Calmagite method. The reaction between calcium and reagents causes a

reddish-violet tint in the sample.

REQUIRED REAGENTS

Code Description Quantity

HI 93720A-0 Ca & Mg indicator 0.5 mL

HI 93720B-0 Alkali solution 0.5 mL

HI 93720C-0 EGTA solution 1 drop

REAGENT SETS

HI 93720-01 Reagents for 100 tests

HI 93720-03 Reagents for 300 tests

For other accessories see page 46.

MEASUREMENT PROCEDURE

• Select the

Calcium Hardness

method using the procedure

described in the

Method Selection

section (see page 15).

• Rinse a graduated beaker several times with deionized

water, fill a 1 mL syringe with the sample, and inject

0.5 mL into the beaker. Fill the beaker up to the 50 mL

mark with hardness-free water.

• Add 0.5 mL of HI 93720A-0 Calcium indicator solution

and swirl to mix.

• Add 0.5 mL of HI 93720B-0 Alkali solution and swirl to

mix. Use this solution to rinse 2 cuvettes before filling

them up to the 10 mL mark.

Calcium Hardness

• Add 1 drop of HI 93720C-0 EGTA solution to one cuvette (# 1), replace

the cap and invert the cuvette several times to mix. This is the blank.

• Place the blank (# 1) into the holder and close the lid.

• Press the Zero key. The meter will show “-0.0-” when the meter is zeroed and ready for

measurement.

• Remove the blank and insert the second cuvette (# 2) into

the instrument.

• Press Read to start the reading. The instrument displays concentration in mg/L of calcium hardness,

as CaCO

• Press s or t to access the second level functions.

• Press the Chem Frm key to convert the result in mg/L of Calcium (Ca).

# 1 # 2

# 1

# 2

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