LaMotte HYDROXIDE, PHENOLPHTHALEIN & TOTAL ALKALINITY TEST KIT WAT-MPH-DR - Manual (Page 2)

HY DROX IDE AL KA LIN ITY PRO CE DURE
This test measures the Hydroxide Alkalinity (Hydrate) of water by
titration of the hydroxyl content following the elimination of any
Carbonate Alkalinity interference by precipitation as BaCO
3
.
1. Fill the test tube (0778) to the 5 mL line with sample water.
2. Add 10 drops of *Barium Chloride Solution, 10% (6117). If
carbonates are present a white precipitate will form.
3. Add one Phenolphthalein Tablet (T-2246). Cap and mix until
tablet disintegrates. If no red color develops, the Hydroxide
Alkalinity is zero. If the sample turns red proceed to Step 4.
4. Fill the Direct Reading Titrator (0382) with the *Alkalinity
Titration Reagent (6102DR). Insert the Titrator tip in the center
hole of the test tube cap. While gently swirling the tube, slowly
press the plunger to titrate the sample until the red or pink color
disappears.
5. Read the Hydroxide Alkalinity directly from the Titrator scale in
ppm CaCO
3
.