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CHLORINE, FREE,
5.
Wipe the outside of
the blank vial with
a towel.
Note: Wiping with a damp
cloth followed by a dry one
removes fingerprints and
other marks.
9.
Remove the cap from
a Free Chlorine DPD-
TNT tube. Add
10 mL of sample.
Note: Fill to the top of the
Hach logo "oval" mark.
Note: A pink color will
develop if chlorine is
present.
continued
6.
Place the blank in the
adapter.
Push straight down on
the top of the vial until it
seats solidly into the
adapter.
Note: Do not move the vial
from side to side as this can
cause errors.
10.
Cap and invert at
least 10 times to dissolve
the powder. This is the
prepared sample.
Note: Use slow, deliberate
inversion for complete
recovery. Ten inversions
should take at least
30 seconds. One inversion
equals turning the vial
upside down, then
returning it to an
upright position.
7.
Cover the vial
tightly with the
instrument cap.
11.
Within 30 seconds
after mixing, wipe the
prepared sample vial
with a towel, then place
it in the adapter.
Push straight down on
the top of the vial until it
seats solidly into the
adapter.
Note: Do not move the vial
from side to side as this can
cause errors.
134
8. Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L Cl2
Note: If Reagent Blank
Correction is on, the
display may show "limit".
See Section 1.
12.
Cover the vial
tightly with the
instrument cap.
Press:
READ
The cursor will move to
the right, then the result
in mg/L free chlorine
will be displayed.
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