Test Procedures
PROCEDURE
Use universal sample holder
1. Homogenize sample if necessary.
2. Preheat COD heater block to 150±2°C.
3. Remove cap from COD tube. Hold vial at a 45° angle. Use a graduated pipet, to carefully
add 0.2 mL sample water allowing the sample to run down the side of the tube.
4. Cap and mix thoroughly.
5. Rinse the outside of the tube with distilled water. Wipe dry with a paper towel.
6. Repeat steps 3 through 5 using 0.2 mL distilled water. This is the reagent blank.
7.
Place tubes in preheated COD block heater and maintain temperature at 150±2°C for
two hours.
8. At the end of the heating period turn the heater off . Wait 20 minutes for the tubes to
cool to 120°C or less.
9. Remove tubes from block heater. Invert several times to mix.
10. Allow to cool to room temperature.
11. Press
ON
button to turn spectrophotometer on.
12. Scroll to and select
PROGRAMMED TESTS
from menu.
13. Scroll to and select
ALL TESTS
(or another sequence containing
27 COD HR 0-15000
)
from
PROGRAMMED TESTS
menu.
14. Wipe the blank tube with a damp towel to remove fi ngerprints and smudges. Wipe with
a dry towel.
15. Scroll to and select
27 COD HR 0-15000
from menu.
16. Insert reagent blank tube into chamber. Align the center of the LaMotte logo on the
tube with the arrow shaped mark molded into the housing at the front edge of the light
chamber. Select
SCAN BLANK
.
17. Remove tube from Spectro.
18. Insert digested water sample tube into chamber. Position tube as instructed above.
Select
SCAN SAMPLE
. Record result. For the most accurate results, take three
readings on each sample and average the results.
19. Press and hold
OFF
button to turn spectrophotometer off or press
EXIT
button to exit
to a previous menu or make another menu selection.
NOTES: Reagents are light sensitive. Unused reagents should be stored in the shipping
container, and in the refrigerator if possible, until needed.
A reagent blank should be run with each set of samples and with each lot of reagents.
The reacted blank will be stable if stored in the dark.
SMART Spectro 2 Test Procedures 05.02.16
COD
, HIGH RANGE
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