LaMotte SODIUM User Manual

SODIUM KIT

DIRECT READING TITRATOR

CODE 7791-DR-02

QUANTITY CONTENTS CODE

15 mL Total Alkalinity Indicator 2786-E
60 mL *Sulfuric Acid, 0.1N *6111DR-H
60 mL *Sodium Hydroxide Solution, 0.1N *6248DR-H
15 mL *Hardness Reagent #5 *4483-E
100 Hardness Reagent #6 Tablets 4484-J
60 mL Hardness Reagent #7 4487DR-H
2 Resin Columns 1079
1 Pipet, 1.0 mL, plastic 0354
3 Test Tubes, 5-10-15 mL, glass, w/cap 0778
1 Test Tube, 5-10-12.9-15-20-25 mL,glass, w/cap 0608
1 Demineralizer Bottle 1151
2 Direct Reading Titrators, 0-500 Range 0383
1 Direct Reading Titrator, 0-200 Range 0382

*WARNING: Reagents marked with an * are considered to be potential health hazards.
To view or print a Material Safety Data Sheet (MSDS) for these reagents go to
www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail, phone or fax.
To order individual reagents or test kit components, use the specifi ed code number.

The Demineralizer Bottle (1151) is the source of all the demineralized water needed in
this test. Read Demineralizer Instructions before performing test.

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

B = SO

A = HCO

=

and Cl– determined by pH titration after ion exchange

4

determined by pH titration

3

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 blue­green color changes to red-orange.

5. Read the test result directly from the Titrator in ppm CaCO

(HCO3 and CO

3

–

)

3

and record as Result A.