LaMotte COD3 Plus, Operator'S Manual

Page: 48 / 119

Cobalt
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
029 Cobalt
) from
Testing
Menu
.
4. Scroll to and select 029 Cobalt from menu.
5. Rinse a tube (0290) with sample water. Fill to 10 mL with sample.
6. Insert the tube into chamber, close lid and select Scan Blank .
7. Remove the tube from colorimeter.
8. Use the 1.0 mL pipet (0354) to add 1 mL of *Cobalt Buff er (4852). Cap and
mix.
9. Use the other 1.0 mL pipet (0354) to add 1 mL of *Cobalt Indicator Reagent
(4853). Cap and mix.
10. Wait 3 minutes.
11. Use the 0.5 mL pipet (0353) to add 0.5 mL Stabilizer Solution (4854). Cap and
invert 15 times to thoroughly mix.
12. Wait 5 minutes. DO NOT MIX.
13. Insert tube into chamber, close lid and select Scan Sample . Record result in ppm
cobalt.
14. Press to turn the 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