LaMotte HYDROXIDE, PHENOLPHTHALEIN & TOTAL ALKALINITY MPH-DC - Manual (Page 2)

HY DROX IDE AL KA LIN ITY
1.
Fill test tube (0778) to 5 mL line with sample water.
2. Add 10 drops of *Barium Chloride Solution, 10% (6117). A white
precipitate will form if carbonates are present.
3. Add one Phenolphthalein Tablet (T-2246). Cap and mix until tablet
disintegrates. If solution does not turn red, the Hydroxide Alkalinity
is zero. If solution turns red, proceed to Step 4.
4. Fill the pipet (0352) with *Alkalinity Titration Reagent (6102PS).
Hold pipet vertically. While gently swirling tube, add *Alkalinity
Titration Reagent, one drop at a time, until color changes from red to
colorless. Count the number of drops added.
5. Multiply number of drops added in Step 4 by 10. Record as ppm
Hydroxide Alkalinity as CaCO
3
.
Number of Drops of Titration Reagent x 10 =
ppm Hydroxide Alkalinity expressed as
ppm Calcium Carbonate (CaCO
3
)