LaMotte ALKALINITY TEST KIT DR-A - Manual (Page 2)

PHENOLPHTHALEIN (P) AL KA LIN ITY PRO CE DURE
1.
Fill test tube (0778) to 5 mL line with sample water.
2 Add two drops of *Alkalinity Indicator # 1 (3870). Cap and mix. If
a red color develops, P alkalinity is present. Proceed to Steps 3-5.
If no red color develops, P alkalinity is not present. Proceed to Step
3 and then skip to Total Alkalinity Procedure Steps 6-9.
3. Fill Direct Reading Titrator with *Alkalinity Reagent B (4493).
Insert Titrator in center hole of test tube cap.
4. While gently swirling tube, slowly depress plunger until red color
disappears. Record test result where plunger tip meets titrator scale.
Record as P Alkalinity in ppm CaCO
3
.
EXAMPLE: Plunger tip is 3 minor divisions below 80 line. The
test result is 80 + (3 x 4) = 92 ppm, since each division is equal to
4 ppm.
5. If plunger tip reaches the bottom line on the titrator scale (200
ppm) before the endpoint color change occurs, refill Titrator and
continue titration. When recording test result, include original
amount of reagent titrated (200 ppm).
NOTE:
Do not move the titrator plunger after P Alkalinity
endpoint has been obtained.
TO TAL (T) AL KA LIN ITY PROCEDURE
6.
Without moving plunger, remove Titrator and test tube cap from
test tube containing sample from Step 4.
7. Add two drops Alkalinity Indicator #2. Cap and swirl to mix. A
blue color will appear. Insert Titrator in center hole of test tube cap.
8. While gently swirling tube, slowly depress plunger until blue color
changes to green. Record test result as T Alkalinity in ppm CaCO
3
.
Include total amount of titration reagent added. (See Step 5).
9. If only Total Alkalinity is to be tested, perform Steps 1, 7 and 8
only, using a full titrator for Step 8.