LaMotte AM-21 Water Pollution Detection Outfit - Manual (Page 50)

6. Use the 1 mL pipet (0354) to add 3-4 mL of deionized water (5115) to
the resin column.
7. Use the 1 mL pipet (0354) to add 5 mL of sample water. Discard all of
the solution that has passed through the column then continue adding
the water sample until at least 10 mL has been collected.
8. Water that has passed through the resin column is now poured into the
first test tube and the volume adjusted to exactly 10 mL.
9. Transfer to a second cell on the demonstration stage.
10. Add three drops of Methyl Orange Indicator with Halidex (2299) to the
second cell and mix by stirring with the spatula (0691).
11. Use the other Titrator (0384) to add TDS Reagent B (4803) to the
second cell 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. This result is “B.”
12. Add result “A” to result “B.” The sum is equal to the total dissolved
solids content of the sample given in parts per million expressed as
Calcium Carbonate.
Care of Resin Column
At the conclusion of any test, the resin column should be treated with
Deionized Water (5115) as in step 6 then stoppered and capped until used
again.
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