LaMotte TOTAL & PHENOLPHTHALEIN ALKALINITY TEST KIT 4533-ZEP - Manual (Page 2)

TO TAL & PHENOLPHTHALEIN
AL KA LIN ITY TEST KIT
DROP COUNT METHOD
4533-ZEP
QUANTITY CONTENTS CODE
100 BCG-MR Tablets T-2311-J
15 mL *Phenolphthalein Indicator, 1% *2246-E
60 mL *Alkalinity Titration Reagent B *4493-H
1 Test Tube, 5-10-15 mL, glass, w/cap 0778
1 Pipet, plain 0352
*WARNING: Reagents marked with a * are considered hazardous substances.
Material Safety Data Sheets (MSDS) are supplied for these reagents. For your safety
read label and accompanying MSDS before using.
To order individual reagents or test kit components, use the specified code number.
PHENOLPHTHALEIN (P) AL KA LIN ITY PRO CE DURE
1.
Fill the test tube (0778) to the 5 mL line with the sample water.
2. Add 3 drops of Phenolphthalein Indicator, 1% (2246). Cap and mix. If
sample turns red, proceed to Step 3. If no red color develops,
P Alkalinity is zero.
3. Fill pipet (0352) with *Alkalinity Reagent B (4493). Hold pipet vertically.
While gently swirling the tube, add *Alkalinity Reagent B drop by drop until
color changes from red to colorless. Count the drops added. DO NOT
DISCARD SAMPLE IF TESTING TOTAL ALKALINITY.
4. Calculate results. Record as ppm Phenolphthalein Alkalinity as CaCO
3
.
# of drops in Step 3 x 10 = ppm Phenolphthalein Alkalinity
TO TAL (T) AL KA LIN ITY PRO CE DURE
5.
Add one BCG-MR Tablet (T-2311) to sample from above. Cap and mix until
disintegrated. Sample color will turn green.
6. Fill pipet (0352) with *Alkalinity Reagent B (4493). Hold pipet vertically.
While gently swirling the tube, add *Alkalinity Reagent B drop by drop until
color changes from green to pink. Count the drops added.
7. Calculate results. Add to result from Phenolphthalein Alkalinity.
Record result as ppm Total Alkalinity as CaCO
3
.
# of drops in Step 6 x 10 = ppm Alkalinity
If only testing Total Alkalinity, do Steps 1, 5 and 6. Multiply number of
drops used in Step 6 by 10. Record as ppm Total Alkalinity as CaCO
3
.
CAL CU LA TION OF AL KA LIN ITY RE LA TION SHIPS
The results obtained from the Phenolphthalein and Total Alkalinity
determinations offer a means for the stoichiometric classification of three principal
forms of alkalinity present in many water supplies. The classification attributes the
entire alkalinity to bicarbonate, carbonate and hydroxide, and assumes the absence
of other weak acids of inorganic or organic composition, such as silica, phosphoric,
and boric.
This classification system assumes the incompatibility of hydroxide and
bicarbonate alkalinities in the same sample. Since the calculations are
on a stoichiometric basis, ion concentrations in the strictest sense are
not represented in the results.
According to this scheme:
A.
Carbonate Alkalinity is present when Phenolphthalein Alkalinity is
not zero but less than the Total Alkalinity.
B. Hydroxide Alkalinity is present if Phenolphthalein Alkalinity is
more than one-half the Total Alkalinity.
C. Bicarbonate Alkalinity is present if Phenolphthalein Alkalinity is
less than one-half the Total Alkalinity.
Mathematical conversion of the result is shown in the following table:
RELATIONSHIP BETWEEN PHENOLPHTHALEIN, TOTAL,
CARBONATE, BICARBONATE & HYDROXIDE ALKALINITY
Result
of Titration
Hydroxide
Alkalinity as
CaCO
3
Carbonate
Alkalinity as
CaCO
3
Bicarbonate
Alkalinity as
CaCO
3
P=0 0 0 T
P 0 2P T-2P
P=aT 0 2P 0
P>aT 2P-T 2(T-P) 0
P=T T 0 0
LaMOTTE COM PANY
Helping Peo ple Solve An a lyt i cal Challenges SM
PO Box 329 • Chestertown • Mary land • 21620 • USA
800-344-3100 • 410-778-3100 (Out side USA) • Fax 410-778-6394
Visit us on the web at www.lamotte.com
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