Hanna-instruments HI 83211 Manual de usuario descargar pdf (Pagina 56)

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 66.

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

SILICA

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Hanna-instruments HI 83211 Manual de usuario Pagina 56