Hanna Instruments HI 83212 User Manual

Page 22

Silica

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

• Press 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 the ▲ or ▼ to access the second level of functions.
• Press the Chem Frm functional key to convert the result in mg/L of Silicon (Si).

• Press the ▲ or ▼ to go back to the measurement screen.

Silica

SILICA

SPECIFICATIONS

Range

0.00 to 2.00 mg/L

Resolution

0.01 mg/L

Accuracy

±0.03 mg/L ±3% of reading

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 50.

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.

10 mL

x 6

1’