Instruction Manual
www.hannainst.com
DearCustomer,
Thank you for choosing a Hanna Product.
Please read the instruction sheet carefully before using the
test kit. It will provide you with the necessary information
for correct use of the kit. If you need additional information,
Remove the chemical test kit from the packing material and
examine it carefully to make sure that no damage has
occurred during shipping. If there is any noticeable dam-
age, notify your Dealer or the nearest Hanna office
immediately.
Each kit is supplied with:
•HI 93705A-0 Silica Reagent, 1 bottle with dropper
(25 mL);
•HI 93705B-0 Silica Reagent, packets (100 pcs);
•HI 93705C-0 Silica Reagent, packets (100 pcs);
• 1 checker disc (containing a mirror, a mirror holder
and the 38066 disc);
• 2 glass vials with caps;
•1 plastic pipette (3 mL).
Note: Any damaged or defective item must be returned in
its original packing materials.
HI 38066
Silica Low Range
Test Kit
ISTR38066 09/00 PRINTED IN ITALY
Silicon is not free in nature, but rather as silica (SiO2) in
crystalline forms, combined with other oxides and metals in
a variety of silicates. Silicon is usually reported as silica
when rocks, sediments, soil and water are analyzed. Silica
isonly slightly soluble in water; solubility and form of silica
in water depend on pH of water and on the minerals,
containing silica, in contact with water. The silica content of
natural water is in the 5 to 25 ppm range. It is important
to estimate silica concentration in case of some industrial
installation such as steam generation and cooling water
systems.
Note: mg/L is equivalent to ppm (parts per million).
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONS
SIGNIFICANCE AND USESIGNIFICANCE AND USE
SIGNIFICANCE AND USESIGNIFICANCE AND USE
SIGNIFICANCE AND USE
CHEMICAL REACTIONCHEMICAL REACTION
CHEMICAL REACTIONCHEMICAL REACTION
CHEMICAL REACTION
INSTRUCTIONSINSTRUCTIONS
INSTRUCTIONSINSTRUCTIONS
INSTRUCTIONS
Determination of silica concentration is an adaptation of the
ASTM D859 method of the heteropoly blue method. The
reaction between silica and reagents causes a blue tint in
the sample which is proportional to the silica concentration.
READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT
• Verify that the mirror, its holder and the disc are pre-
installed in the checker disc. If not, install them as
shown in the figure.
Range 0 to 1.0 mg/L (ppm) as SiO2
SmallestIncrement 0.02 mg/L (ppm) SiO2
AnalysisMethod Colorimetric
Sample Size 20 mL
Number of Tests 100
CaseDimensions 235x175x115 mm (9.2x6.9x4.5")
Shipping Weight 580 g (20.4 oz) 20 mL
The chemicals contained in this kit may be hazardous if
improperly handled. Read the relevant Health and Safety
Data Sheet before performing this test.
HEALTH AND SAFETYHEALTH AND SAFETY
HEALTH AND SAFETYHEALTH AND SAFETY
HEALTH AND SAFETY
REFERENCESREFERENCES
REFERENCESREFERENCES
REFERENCES
Adaptation of the ASTM D859 method of the Heteropoly
Blue Method.
• Usingtheplasticpipette,filleach glass
vial with 20 mL of sample (up to the
mark).
• Insert one of the vials into the left hand opening of the
checker disc. This is the blank.
• Add to the other
vial 6 drops of
HI93705A-0 re-
agent. Replace
the cap, shake
and wait for 5
minutes.
• Remove the cap,
add 1 packet of
HI93705B-0re-
agent. Replace
the cap, shake
and wait for 2
minutes.
• Remove the cap and
add 1 packet of HI
93705C-0 reagent.
Replace the cap and
shake until the pow-
der has completely dissolved.
• Waitfor 5 minutestoallowreaction to
complete. This is the reacted sample.
• Remove the cap and insert
the reacted sample into the
right hand opening of the
checkerdisc.
• Holdthecheckerdiscsothat
alight source illuminatesthe
samples from the top.
• Keep the checker disc at a distance of 30-40 cm (12-
16") to match the color. Rotate the disc while looking at
the color test windows and stop when you find the color
match. Read the value in the result window directly in
mg/L (or ppm) of Silica.
For best results: Perform the reading three times and take
the average value (divide by 3 the sum of the three
numbers). Intensely colored samples will make the
color matching difficult and they should be ad-
equatelytreated beforeperformingthe test.Suspended
matter in large amounts should be removed by prior
filtration.
Caution: Ultraviolet radiation may cause fading of colors.
When not in use, keep the disc protected from light,
in a cool and dry place.
Interferences: phosphate above 50 ppm, sulfide, high
dissolved salts concentration, high concentration of
iron.
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