Test Procedures
PROCEDURE
Use universal sample holder.
1. Press
ON
button to turn spectrophotometer on.
2. Scroll to and select
PROGRAMMED TESTS
from menu.
3. Scroll to and select
ALL TESTS
(or another sequence containing
22 Chromium
) from
TESTING MENU
.
4. Scroll to and select
22 Chromium
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 Spectro. Use the 0.1g spoon (0699) to add one measure of
*Chromium Reagent Powder (V-6276). Cap and shake until powder dissolves. Wait 3
minutes for full color development.
8. During waiting period, fold a piece of fi lter paper (0465) in half then half again to form
a cone. Push corners together to open end, and insert into funnel (0459).
9. At the end of 3 minute waiting period, fi lter sample into a clean tube. Mix. Insert tube
into chamber, close lid and select
SCAN SAMPLE
. Record result.
10. 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: To convert result 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.
Highly buff ered waters may give poor results and require a more careful pH adjustment.
Before adding *Chromium Reagent Powder, adjust pH of sample to pH 3-4.
CHROMIUM,
HEXAVALENT
SMART Spectro 2 Test Procedures 05.02.16
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