LaMotte SODIUM 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
PROCEDURE
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.