LaMotte SODIUM TEST KIT - Manual (Page 3)

PART B: SULFATE AND CHLORIDE ANIONS
In this part a water sample is passed through an ion exchange column to
exchange the associated cations (Na, Ca, Mg, etc.) for hydrogen ions,
which are then titrated with Sodium Hydroxide Solution. Two identical
resin columns are furnished in this kit. Each column can be used to
exchange 20 water samples, after which it should be discarded. Keep an
accurate record of the number of times a column has been used.
1.
Attach a resin column (1079) to a test tube (0778) by inserting the
tip of the column in the center hole of the tube cap. Remove the
column cap.
2. Fill another test tube (0778) half full with deionized water. Use the
1.0 mL pipet (0354) to add 4 mL of deionized water (5115) to the
column. If the water draining from the column is colored, add
additional deionized water in 1.0 mL increments until the discharge is
clear.
3. Use the 1.0 pipet (0354) to add 5.0 mL of sample water to the resin
column. Now discard all of the water passed through the column up
to this point.
4. Add sample water to the column until the discharge reaches the
15 mL line on the test tube. Fill the third test tube (0778) exactly to
the 10 mL line with this treated sample.
5. Add 3 drops of Total Alkalinity Indicator (2786). Cap and mix.
6. Fill the second Direct Reading Titrator, 0-500 Range (Black Print,
0383) with the *Sodium Hydroxide, 0.1N (6248DR) and insert the
tip in the cap.
7. While gently swirling the tube, titrate until the color changes from
red, or red-orange, to blue, or blue-green.
8. Read the test result from the Titrator in ppm CaCO
3
(SO
4
= and Cl – )
and record as Result B.