Hanna-instruments HI 83099 Manual do Utilizador descarregar pdf (Página 61)

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Silica

• 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 93705C-0 Amino acid reagent and shake until it is

completely dissolved.

• Reinsert the cuvette into the instrument.

• Press Timer and the display will show the countdown

prior to the measurement. Alternatively, wait for exactly

3 minutes and press Read. When the timer ends the

meter will perform the reading. The instrument displays

concentration in mg/L of silica (SiO

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

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

• Press s or t to return to the measurement screen.

INTERFERENCES

Interference may be caused by:

Phosphate above 60 mg/L

Phosphate above 75 mg/L

Sulfide and high concentration of iron

Eliminate color and turbidity interferences by zeroing the meter with the original water sample.

Silica

SILICA

SPECIFICATIONS

Range 0.00 to 2.00 mg/L

Resolution 0.01 mg/L

Accuracy ±0.03 mg/L ±3% of reading at 25 °C

Typical EMC ±0.01 mg/L

Deviation

Light Source Tungsten lamp with narrow band interference filter @ 610 nm

Method Adaptation of the

ASTM Manual of Water and Environmental Technology,

D859,

Heteropoly Blue method. The reaction between silica and reagents causes a blue tint in

the sample.

REQUIRED REAGENTS

Code Description Quantity

HI 93705A-0 Molybdate 6 drops

HI 93705B-0 Citric acid 1 packet

HI 93705C-0 Amino acid 1 packet

REAGENT SETS

HI 93705-01 Reagents for 100 tests

HI 93705-03 Reagents for 300 tests

For other accessories see page 132.

MEASUREMENT PROCEDURE

• Select the

Silica

method using the procedure described in

the

Method Selection

section (see page 12).

• Fill the cuvette with 10 mL of unreacted sample (up to the

mark).

• Add 6 drops of HI 93705A-0 Molybdate reagent. Replace

the cap and swirl the solution.

• Wait for 4 minutes, add the content of one packet of

HI 93705B-0 Citric acid reagent and shake until it is

completely dissolved.

• Wait for 1 minute. This is the blank.

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

10 mL

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