LaMotte SODIUM TEST KIT - Manual (Page 2)

Carefully read the instruction manual for the LaMotte Direct Reading
Titrator before performing the titration described below. Three Titrators
are included in this set and should not be used interchangeably. The test
results are read directly from the scale on the Titrator barrel. The Titrators
are:
Code Range
Print
Color Minor
Division To
Titrate
0383 0 - 500 Black
10 ppm
Bicarbonate &
Carbonate Anions
0383 0 - 500 Black
10 ppm
Sulfate & Chloride
Anions
0382 0 - 200 Red
4 ppm
Calcium &
Magnesium Cations
The Sodium test involves three separate titrations to determine the
anions and cations in aqueous solution. These results are then used in the
formula:
ppm Sodium = (A + B - C) x 0.46
A = HCO
3
determined by pH titration
B = SO
4
= and Cl – determined by pH titration after ion exchange
C = Ca ++ and Mg ++ determined by Total Hardness Titration
PRO CE DURE
PART A: BICARBONATE AND CARBONATE ANIONS
1.
Fill a test tube (0778) to the 10 mL line with sample water.
2. Add 3 drops of Total Alkalinity Indicator (2786). Cap and swirl to
mix.
3. Fill a Direct Reading Titrator, 0-500 Range (Black Print, 0383) with
*Sulfuric Acid, 0.1N (6111DR) and insert Titrator tip in the center
hole of the test tube cap.
4. While gently swirling the tube, slowly press the plunger to titrate
until the blue-green color changes to red-orange.
5. Read the test result directly from the Titrator in ppm CaCO
3
(HCO
3
and CO
3
– ) and record as Result A.