Test Procedures
PROCEDURE
Use universal sample holder
1. Press
ON
button to turn spectrophotometer on.
2. Scroll to and select
PROGRAMMED TESTS
.
3. Scroll to and select
ALL TESTS
(or another sequence containing
23 Chromium-TesTab
) from
TESTING MENU
.
4. Scroll to and select
23 Chromium-TesTab
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 Spectro.
8. Add one *Chromium Spectrophotometric Grade Tablet (3889).
9. Use Tablet Crusher (0175) to crush tablet.
10. Cap tube.
11. Shake vigorously for 30 seconds.
12. Wait 3 minutes.
13. Insert tube into chamber, close lid and select
SCAN SAMPLE
. Record result in ppm
chromium.
14. Press and hold
OFF
button to turn the spectrophotometer off or press
EXIT
button to
exit to a previous menu or make another menu selection.
NOTES: 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.
To convert results to ppm chromate (CrO
4
-2
), multiply by 2.23. To convert result to ppm
sodium chromate (Na
2
CrO
4
) multiply by 3.12.
CHROMIUM
, TESTAB
SMART Spectro 2 Test Procedures 05.02.16
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