LaMotte Fresh Water Aquaculture - Manual (Page 8)

8
TITRIMETRIC: DIRECT READING TITRATOR
In a titrimetric method, titrating solution (or titrant) is added to a treated sample
until a color change occurs. The volume of titrant required to reach this endpoint is
proportional to the concentration of the factor being tested. Direct Reading Titrators
provide results directly in the appropriate concentration for the test - no counting of
drops, no calculations.
The Titrator consists of a plastic barrel, a plastic plunger, and a plastic adapter tip. The
adapter tip reduces the size of the drops that are dispensed, increasing the precision of
the test results. DO NOT remove the plunger or adapter tip from the Titrator.
Fill the test
tube to the
appropriate
line with
sample water.
Add reagents
as specifi ed
in the instructions
for the individual
test method. Cap
with the special test
tube cap. Mix by
swirling gently. Depress the
Titrator plunger
to expel air. Insert
Titrator into the
plastic fi tting of
the titrating
solution bottle
and invert.
To fi ll Titrator, slowly
withdraw the plunger
until the bottom of the
plunger is
opposite
the zero
mark on
the scale.
I If small air
bubbles appear in
the barrel, expel them by
partially fi lling the barrel
and pumping the titration
solution back into the
reagent container. Repeat
until bubble disappears.
1 2 3
4
6
5
7 8
Note:
Insert the Titrator
into the center hole
of the test tube
cap. While gently
swirling tube, add
titrating solution
one drop at a time
until the desired
color changes occur.
Follow individual
test instructions.
Turn the bottle
right-side-up
and remove the
Titrator.
Read the test
result directly
from the scale
where the large
ring on the Titrator
meets the Titrator barrel.
When testing is
complete, discard
titrating solution in
Titrator. Do not return
the titrant to the
reagent bottle. Rinse
Titrator and titration
tube thoroughly. Do
not remove the plunger
or the adapter tip from
the Titrator.
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Plunger Barrel Adapter Tip