LaMotte SMART 2 - Manual (Page 116)

SAMPLE
HANDLING &
PRESERVATION: Analysis for chromium should be made as quickly as possible
after sample collection since storage in glass or plastic
containers may result in low chromate values.
INTERFERENCES: High concentrations of mercurous and mercuric ions may
interfere.
HEXAVALENT CHROMIUM PROCEDURE
1. Press and hold ON button until colorimeter turns on.
2. Press ENTER to start.
3. Press ENTER to select TESTING MENU.
4. Select ALL TESTS (or another sequence containing 22 Chromium)
from TESTING MENU.
5. Scroll to and select 22 Chromium from menu.
6. Rinse a clean tube (0290) with sample water. Fill to 10 mL line with
sample water.
7. Insert tube into chamber, close lid and select SCAN BLANK.
8. Remove tube from colorimeter. 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.
9. 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).
10. 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.
11. Press
OFF button to turn colorimeter off or press EXIT button to exit to a
previous menu or make another menu selection.
Chromium–Hexavalent, Trivalent & Total 2/4 Smart2 TEST PROCEDURES 10.04