LaMotte Fresh Water Aquaculture - Manual (Page 16)

16
CHLORIDE TEST PROCEDURE
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Fill the test tube
(0608) to the
15 mL line
with the
sample water.
Add 3 drops
of *Cloride
Reagent #1
(4504).
Add one drop of
Phenolphthalein
Indicator, 1%
(2246). If sample
turns pink, add
*Sulfuric Acid,
0.5N (6090) one
drop at a time,
mixing after each
drop, until pink
color disappears.
Fill Direct
Reading
Titrator (0382)
with *Chloride
Reagent #2
(4505DR).
Read the test result directly
from the scale where the large
ring on the Titrator meets the
Titrator barrel. Record as ppm
Chloride.
Insert the
Titrator into
the center
hole of the
test tube cap.
While gently
swirling the
tube, slowly
press the
plunger to
titrate until
yellow color
changes from
yellow to orange
or orange-red.
Cap and swirl
to mix.
Solution will
turn yellow.
NOTE: If the plunger tip reaches the bottom line on the scale (200 ppm) before
the endpoint color change occurs, refi ll the Titrator and continue the titration.
When recording the test results be sure to include the value of the original amount
of reagent dispensed (200 ppm).