LaMotte HYDROXIDE, PHENOLPHTHALEIN & TOTAL ALKALINITY MPH-DC - Manual (Page 3)

PHENOLPHTHALEIN (P) AL KA LIN ITY
1.
Fill test tube (0778) to 5 mL line with sample water.
2. Add one Phenolphthalein Tablet (T-2246). Cap and mix until tablet
disintegrates. If solution turns red proceed to Step 3. If solution does
not turn red, P Alkalinity is zero.
3. Fill 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.
4. Multiply the number of drops added in Step 3 by 10. Record as ppm
P Alkalinity as CaCO
3.
Number of Drops of Titration Reagent x 10 =
ppm Phenolphthalein Alkalinity expressed as
ppm Calcium Carbonate (CaCO
3
)
5. Save sample for T Alkalinity test.
TO TAL (T) AL KA LIN ITY
1.
Use the sample from the P Alkalinity test, or fill the test tube (0778)
to the 5 mL line with sample water.
2. Add one BCG-MR Indicator Tablet (T-2311). Cap and mix until
tablet disintegrates.
3. Fill the pipet 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 green to pink.
Count the number of drops added.
4. Multiply number of drops used in Step 3 by 10. Record as ppm
T Alkalinity as CaCO
3
.
NOTE: If the same sample is used for both the P and T Alkalinity
tests, add both test results to calculate T Alkalinity.
Number of Drops of Titration Reagent x 10 =
Total Alkalinity expressed as
ppm Calcium Carbonate (CaCO
3
)
When testing swimming pool water, consult the Acid Demand Index
(1546) to determine if the Total Alkalinity value is excessive. The Index
will indicate the recommended quantity of acid required to offset high
alkalinity content.