Hanna Instruments c 99 Manuel D’Utilisation

128

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 141.

MEASUREMENT PROCEDURE

• Select the program number corresponding to Silica on the

secondary LCD by pressing PROGRAM W and V.

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

the mark).

• Add 6 drops of HI 93705A Molybdate

reagent. Replace the cap and swirl
the solution.

• Wait for 4 minutes, add the content

of one packet of HI 93705B Citric
acid reagent and shake until it is
completely dissolved.

Silica