REFERENCES
REFERENCES
REFERENCES
REFERENCES
REFERENCES
Standard Methods for the Examination of Water and
Wastewater
, 18
th
Edition, 1992
APHA/AWWA/WEF.
HEALTH AND SAFETY
HEALTH AND SAFETY
HEALTH AND SAFETY
HEALTH AND SAFETY
HEALTH AND SAFETY
The chemicals contained in this kit may be hazardous if
improperly handled. Read the relevant Health and Safety
Data Sheet before performing this test.
12- 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.
13- Read the value in the result window directly in mg/L
(ppm) of Zinc.
14- If the color is too intense to make a color match, then
the original sample needs to be diluted. In this case
perform the test as follows.
15- Using the 3 mL plastic pipette, fill one glass vial with
1.5 mL of sample exactly and add demineralized water
up to the 20 mL mark, replace the cap and swirl to
mix.
16- Prepare the blank as before and insert it into the left
hand opening of the checker disc. Follow the procedure
from step 6 to step 12.
17- Multiply the reading value by 5 to obtain mg/L (ppm)
of Zinc.
18- Discard the reacted sample after measurement, because
the glass might become permanently stained.
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 determination difficult and they should be
adequately treated before performing the test. Sus-
pended 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.
1.5 mL
