LaMotte Fresh Water Aquaculture - Manual (Page 19)

19
Part 2 - Adding the Reagents
NOTE: Be careful not to introduce air into the sample while adding
the
reagents.
Remove the
cap from the
bottle.
Immediately add 8
drops of *Manganous
Sulfate Solution (4167)
and Add 8 drops of
*Alkaline Potassium
Iodide Azide (7166).
Cap the bottle and mix by
inverting several times.
A precipitate will form.
Allow the precipitate
to settle below the
shoulder of the bottle.
Add 8 drops of
*Sulfuric Acid, 1:1
(6141WT).
Cap and gently invert the bottle
to mix the contents until the
precipitate and the reagent have
totally dissolved. The solution
will be clear
yellow to
orange if the
sample contains
dissolved oxygen.
NOTE: At this point the sample has been “fi xed” and contact between the
sample and the atmosphere will not affect the test result. Samples may be
held at this point and titrated later.
1 2
3 4
5 6