Hanna Instruments hi 38066 Benutzerhandbuch

www.hannainst.com

Dear Customer,
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,
do not hesitate to e-mail us at tech@hannainst.com.
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.

ISTR38066      09/00     PRINTED IN ITALY

Silicon is not free in nature, but rather as silica (SiO

2

) 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
is only 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).

SPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONS

SIGNIFICANCE AND USE

SIGNIFICANCE AND USE

SIGNIFICANCE AND USE

SIGNIFICANCE AND USE

SIGNIFICANCE AND USE

CHEMICAL REACTION

CHEMICAL REACTION

CHEMICAL REACTION

CHEMICAL REACTION

CHEMICAL REACTION

INSTRUCTIONS

INSTRUCTIONS

INSTRUCTIONS

INSTRUCTIONS

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 SiO

2

Smallest Increment

0.02 mg/L (ppm) SiO

2

Analysis Method

Colorimetric

Sample Size

20 mL

Number of Tests

100

Case Dimensions

235x175x115 mm (9.2x6.9x4.5")

Shipping Weight

580 g (20.4 oz)

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 SAFETY

HEALTH AND SAFETY

HEALTH AND SAFETY

HEALTH AND SAFETY

HEALTH AND SAFETY

REFERENCES

REFERENCES

REFERENCES

REFERENCES

REFERENCES

Adaptation of the ASTM D859 method of the Heteropoly
Blue Method.

• Using the plastic pipette, fill each 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
HI 93705A-0 re-
agent. Replace

the cap, shake
and wait for 5
minutes.

• Remove the cap,

add 1 packet of
HI 93705B-0 re-
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.

• Wait for 5 minutes to allow reaction to

complete. This is the reacted sample.

• Remove the cap and insert

the reacted sample into the
right hand opening of the
checker disc.

• Hold the checker disc so that

a light source illuminates the
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-
equately treated before performing the 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.