LaMotte COD3 Plus, Operator'S Manual

Page: 78 / 119

Hydrazine
COD3 Plus Colorimeter 10.16
PROCEDURE
1. Press and hold until colorimeter turns on.
2. Press
ENTER
to select
Testing Menu
.
3. Select
All Tests
(or another sequence containing
049 Hydrazine
) from
Testing
Menu
.
4. Scroll to and select 049 Hydrazine from menu.
5. Rinse a clean tube (0290) with sample water. Fill to the 10 mL line with sample.
6. Insert tube into chamber, close lid and select Scan Blank .
7. Remove tube from colorimeter. Use the 1 mL pipet (0354) to add 4 mL of
*Hydrazine Reagent A (4841). Cap and mix.
8. Use the 0.15 g spoon (0727) to add one measure of Hydrazine Reagent B Powder
(4842). Cap and shake vigorously for 10 seconds. Wait 2 minutes for maximum
color development. An undissolved portion of Hydrazine Reagent B may remain in
bottom of tube without adversely aff ecting results.
9. At the end of the 2 minute waiting period, mix, insert tube into chamber, close lid
and select
Scan Sample
. Record result.
10. Press to turn colorimeter off or press EXIT to exit to a previous menu or
make another menu selection.
NOTE: For best possible results, a reagent blank should be determined to account for
any contribution to the test result by the reagent system. To determine the reagent
blank, follow the above test procedure to scan a distilled or deionized water blank. Then
follow the above procedure to perform the test on a distilled or deionized water sample.
This test result is the reagent blank. Subtract the reagent blank from all subsequent
test results of unknown samples. It is necessary to determine the reagent blank only
when a new lot number of reagents is obtained.
Testing