User Manual

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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 128.

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.

• 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 93750B-0 reagent. Replace the cap and gently mix for

one minute by slowly turning the cuvette upside down.

• Reinsert the cuvette into the instrument.

• Press Timer and the display will show the countdown prior to the

measurement or, alternatively, wait for 2 minutes and press Read.

When the timer ends the meter will perform the reading. The

instrument displays the results in mg/L (ppm) of potassium (K).

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

• Press the Chem Frm key to convert the result in mg/L of potassium oxide (K

O).

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

INTERFERENCES

Interferences may be caused by:

Ammonium above 10 ppm

Calcium above 10000 ppm as CaCO

Chloride above 12000 ppm

Magnesium above 8000 ppm as CaCO

Sodium above 8000 ppm

Potassium LR

1’

10 mL