
128
SILICA
SILICA
SILICA
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 93705
A
-0
Molybdate
6 drops
HI 93705
B
-0
Citric acid
1 packet
HI 93705
C
-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
10 mL
x 6