LaMotte SMART Spectro Spectrophotometer - Manual (Page 101)

INTERFERENCES: High concentrations of mercurous and mercuric ions may
interfere.
HEXAVALENT CHROMIUM PROCEDURE
Use universal sample holder.
1. Press and hold
ON
button until spectrophotometer turns on.
2. Scroll to and select 22 Chromium 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 10 mL line with
sample water.
6. Insert tube into chamber, close lid and select SCAN BLANK.
7. Remove tube from Spectro. Use 0.1 g spoon (0699) to add one level
measure of *Chromium Reagent Powder (V-6276). Cap and shake for one
minute. Wait 3 minutes.
8. During the waiting period, fold a piece of filter paper in half, then in 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, filter sample into a clean tube
(0290). Cap and mix. Insert tube into chamber, close lid and select SCAN
SAMPLE
. Record result.
10. Press
OFF button to turn spectrophotometer off or press EXIT button to
exit to a previous menu or make another menu selection.
Chromium-Hexavalent, Trivalent & Total 2/4 SMART SPECTRO TEST PROCEDURES 10.04