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LaMotte 7240-01 P and T Alkalinity Test Kit
 

7240-01 PROCEDURE

PHENOLPHTHALEIN (P) ALKALINITY

  1. Rinse sample tube with sample water. Fill with desired sample size selected from table above.

  2. Add *Phenolphthalein Indicator, 0.5% (2258) as follows:

  • 25 mL sample 2 drops

  • 10 mL sample 1 drop

  • 5 mL sample 1 drop

Mix. Solution will turn pink if P alkalinity is present.  If solution is colorless, P alkalinity is zero; proceed to Step 5.

  1. While gently swirling tube, add *Sulfuric Acid, 0.12N (7748WT), one drop at a time, until pink color disappears.  Count the number of drops added.  Hold bottle vertically.

  2. Multiply number of drops used in Step 3 as follows:

  • 25 mL sample multiply by 10

  • 10 mL sample multiply by 25

  • 5 mL sample multiply by 50

Record as ppm P Alkalinity as CaCO3.

DO NOT DISCARD SAMPLE IF TESTING FOR TOTAL (T) ALKALINITY.

TOTAL (T) ALKALINITY

  1. To sample from Step 4 add Total Alkalinity Indicator (2786) as follows:
  • 25 mL sample 3 drops
  • 10 mL sample 2 drops
  • 5 mL sample 2 drops

Mix. Solution will turn green.

  1. While gently swirling tube, add *Sulfuric Acid, 0.12N (7748WT), one drop at a time, until green color changes to red.  Count the number of drops added.  Hold bottle vertically.
  2. Multiply number of drops used in Step 6 as follows:
  • 25 mL sample multiply by 10
  • 10 mL sample multiply by 25
  • 5 mL sample multiply by 50

Add this result to the P Alkalinity from Step 4.  Record as ppm T Alkalinity as CaCO3.

 

PURCHASE TEST KIT

ITEM NUMBER DESCRIPTION PRICE

QTY LLI724001

P & T Alkalinity Drop Count Test Kit
$35.90

PURCHASE REAGENTS

QTY LLI2258E

Phenolphthalein Indicator 0.5%
$3.75

QTY LLI2786E

Total Alkalinity Indicator
$4.15

QTY LLI7748WTG

Sulfuric Acid 0.12N
$5.00

QTY LLI0715

Test Tube, 5-10-25 mL Plastic With Cap
$2.45
COMPARISON CHART
Item #
Test System
Range/Sensitivity
# of Tests
# of Reagents
LLI4491DR Total Alkalinity
Direct Reading Titrator
0–200 ppm
4ppm as CaCO
3
50 at 200 ppm 2
L1018402 P & T Alkalinity
Direct Reading Titrator
0–200 ppm
4 ppm as CaCO
3
50 at 200 ppm 3
L1018502 P & T Alkalinity
Dropper Pipet
1 drop = 10 ppm as CaCO3 50 at 200 ppm 3
LLI724001 P & T Alkalinity
Dropper Bottle
1 drop = 10, 25, or 50 ppm as CaCO3 100 at 500 ppm 3
L1018002 P & T Alkalinity
Direct Reading Titrator
0–200 ppm
4 ppm as CaCO
3
50 at 200 ppm 3
L1018202 P, T, & OH Alkalinity
Dropper Pipet
1 drop = 10 ppm as CaCO3 50 at 200 ppm 4
LLI3467 P & T Alkalinity
Direct Reading Titrator
0-200 ppm
4 ppm as CaCO
3
50 at 200 ppm 3