LaMotte TDS KIT 4801-DR-01 - Manual (Page 2)

PROCEDURE
PART A
1. Fill a test tube (0778) to 10 mL line with sample water.
2. Add 3 drops *Methyl Orange Indicator, 0.1% w/Halidex (2299). Cap and mix.
Solution will turn yellow.
3. Fill a Direct Reading Titrator (0384) with *TDS Reagent A (4802DR). Insert
Titrator into the center hole of the test tube cap.
4. While gently swirling the test tube, slowly press the Titrator plunger to dispense
*TDS Reagent A until the yellow color changes to pink. Read the test result directly
from the scale where the large ring on the Titrator meets the Titrator barrel. Record
as Result A. Discard the test sample and any TDS Reagent A remaining in the
Titrator.
PART B
In the second part of the TDS test, the sample water is passed through an ion exchange
column, which exchanges the various cations (Na, Ca, Mg, etc.) for hydrogen ions,
which are then titrated with *TDS Reagent B. Two ready-to-use resin columns are
furnished in this kit. Each column may be used for twenty water samples before being
discarded. Keep a record of the number of times a column is used.
5. Suspend a resin column (1079) in the second test tube (0778) by inserting the tip
of the column into the center hole of the test tube cap.
6. Add a small amount of Demineralized Water (3 or 4 mL) to the resin column.
7. Use the 1.0 mL pipet (0354) to add 5 mL of sample water to the column.
8. When all of this water has passed through the column, remove the cap and discard
the solution collected in the tube.
9. Replace the cap and the resin column and continue adding sample water to the
column, using the pipet, until exactly 10 mL has been collected in the test tube.
Remove the cap and column.
10. Add 3 drops of *Methyl Orange Indicator, 0.1% w/Halidex (2299). Cap and mix.
Solution will turn red.
11. Fill the second Titrator with *TDS Reagent B (4803DR). Titrate the sample until
the red color changes to yellow. Read the test result directly from the scale where
the large ring on the Titrator meets the Titrator barrel. Record as Result B.
12. Add Result A and Result B. Record as ppm total dissolved solids as CaCO
3
.
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PO Box 329 • Chestertown • Maryland • 21620 • USA
800-344-3100 • 410-778-3100 (Outside U.S.A.) • Fax 410-778-6394
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