LaMotte SMART 2 - Manual (Page 168)

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 53 Iron Phen)
from TESTING MENU.
5. Scroll to and select 53 Iron Phen from menu.
6. Rinse a clean tube (0290)with sample water. Fill to the 10 mL mark with
sample.
7. Insert tube into chamber, close lid and select SCAN BLANK.
8. Remove the tube from colorimeter. Remove the cap and add 6 drops of
*Acid Phenanthroline Indicator (2776). Cap and invert the tube 4 times
to mix reagents. Wait five minutes for maximum color development.
9. After five minutes, mix, insert tube into chamber, close lid and select
SCAN SAMPLE
. Record result as ppm Ferrous Iron.
10. Remove the tube from colorimeter. Use the 0.1g spoon (0699) to add one
measure of *Iron Reducing Reagent (2777). Cap and invert 15-20 times
times to mix. Wait 5 minutes for maximum color delelopment.
11. After 5 minutes, mix, insert tube into chamber, close lid and select SCAN
SAMPLE.
Record result as ppm Total Iron.
12. Press
OFF button to turn colorimeter off or press EXIT button to exit to a
previous menu or make another menu selection.
13. Total Iron (ppm) - Ferrous Iron (ppm) = Ferric Iron (ppm)
þ NOTE: 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.
It is necessary to determine the reagent blank only when a new lot number of
reagents is obtained.
Iron 1,10-Phenanthroline 2/2 Smart2 TEST PROCEDURES 1.07