Hanna Instruments HI 38067 - Manual (Page 2)

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.
16- Using the syringe, add 0.25 mL of
sample to the other vial and add
demineralized water up to the 10 mL
mark. Replace the cap and shake.
Note: To measure exactly
0.25 mL of sample
with the syringe,
push the plunger
completely into the sy-
ringe and insert the
tip into sample. Pull
the plunger out until
the lower edge of the
seal is on the 0.0 mL
mark of the syringe. Insert the syringe into the vial
and push the reagent out until the lower edge of the
seal is on the 0.25 mL mark.
15- Follow the instructions from step 6 to 12.
16- Read the value in the result window and multiply it by
20 to obtain 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.
10 mL