172
8.55. SILICA LOW RANGE
SPECIFICATIONS
Range
0.00 to 2.00 mg/L (as SiO
2
)
Resolution
0.01 mg/L
Accuracy
±0.03 mg/L ±3% of reading at 25 °C
Light Source
LED with narrow band interference filter @ 610 nm
Method
Adaptation of the ASTM Manual of Water and Environmental Technology,
D859, Heteropoly Molybdenum Blue method.
REQUIRED REAGENTS
Code
Description Quantity
HI93705A‑0
Silica Low Range Reagent A
6 drops
HI93705B‑0
Silica Low Range Reagent B
1 packet
HI93705C‑0
Silica Low Range Reagent C
1 packet
REAGENT SETS
HI93705‑01
Reagents for 100 tests
HI93705‑03
Reagents for 300 tests
For other accessories see page 200.
MEASUREMENT PROCEDURE
• Select the
Silica LR
method using the procedure described
in the Method Selection section (see page 18).
• Fill the cuvette with 10 mL of unreacted sample
(up to the mark).
• Add 6 drops of
HI93705A‑0
Silica Low Range
Reagent A. Replace the cap and swirl the solution.
• Press Timer and the display will show the
countdown prior to adding
HI93705B‑0
Silica Low
Range Reagent B, or alternatively wait 4 minutes.
• Add one packet of
HI93705B‑0
Silica Low Range
Reagent B and shake until it is completely dissolved.
• Press
Continue
and the display will show the countdown,
or alternatively wait 1 minute.
10 mL
SILICA LOW RANGE