LaMotte AM-21 Water Pollution Detection Outfit - Manual (Page 7)

Procedure
1. Fill the test tube (0778) to the 5.0 mL line with the sample water.
2. Add one Phenolphthalein Table (T-2246). Cap and mix until the tablet
is disintegrated. If no red color develops, the “P” Alkalinity is zero. If the
“P” Alkalinity is zero, go to Step 5.
3. Fill the Direct Reading Titrator (0382) with *Alkalinity Titration
Reagent B (4493).
4. Insert the titrator tip into the test tube cap. Slowly add *Alkalinity
Titration Reagent B (4493) while swirling to mix, until the red color
disappears. Read the test result directly from the scale where the large
ring on the Titrator meets the Titrator barrel. This is the “P” or
Phenolphthalein Alkalinity. (Do not refill the Titrator for Step 6.)
5. Remove the cap and add 3 drops of Total Alkalinity Indicator (2786) to
the test sample. Replace the cap and swirl the tube to mix the indicator
with the sample.
6. Continue to add the *Alkalinity Titration Reagent B (4493) with
mixing until the color of the sample changes from greenish blue to a
definite pink color. This is the “T” or Total Alkalinity reading, also know
as the “M” Alkalinity.
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