LaMotte DEHA TEST KIT 4790 - Manual (Page 2)

3. Thoroughly clean tubes immediately after each test to avoid
staining and future contamination.
4. Ferrous ions, Fe +2 , will give a false positive. The contribution of Fe +2
to reading can be determined by testing a second sample and
skipping Step 4. This result should be subtracted from previous
result.
PRO CE DURE
1.
Fill test tube (0106) to the 5 mL line with sample water.
2. Add 3 drops of *DEHA Reagent 1 (4791) and 3 drops of *DEHA
Reagent 2 (4792).
3. Cap and mix.
4. Add 3 drops of *DEHA Reagent 3 (4793). Cap and mix.
NOTE:
If the alkalinity of the sample is over 300 ppm, use the
following number of drops of *DEHA Reagent 3:
Alkalinity, ppm
Drops of
*DEHA Reagent 3
300-399 4
400-499 5
500-599 6
600-699 7
700-799 8
800-899 9
900-999 10
5. Wait exactly 10 minutes.
6. Immediately insert test tube into top of Octa-Slide Viewer (1100).
Slide DEHA Octa-Slide Bar (3442) into Octa-Slide Viewer. Match
sample color to a color standard. Record result as ppm DEHA.
NOTE: This test kit will also test for the oxygen scavenger erythorbic
acid (also called isoascorbic acid or araboascorbic acid). Follow the test
instruction and multiply the results by 4 to get ppm Erythorbic Acid.
DEHA x 4 = Erythorbic Acid
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