LaMotte SMART 2 - Manual (Page 176)

PROCEDURE
1. Press and hold ON until colorimeter turns on.
2. Press ENTER to select TESTING MENU.
3. Select ALL TESTS (or another sequence containing 054 Lead) from
TESTING MENU
.
4. Scroll to and select 054 Lead 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 colorimeter. Empty the tube. Use the Syringe
(0807) to add 5 mL of sample to the tube.
8. Add 5 mL *Ammonium Chloride Buffer (4032) to fill the tube to the 10
mL line. Swirl to mix.
9. Add 3 drops *Sodium Cyanide, 10% (6565). Swirl to mix.
10. Use the 0.5 mL pipet (0353) to add 0.5 mL *PAR Indicator (4033). Swirl
to mix.
11. Use the 0.5 mL pipet (0353) to add 0.5 mL Stabilizing Reagent (4022).
Cap and mix.
12. Insert tube into chamber, close lid and select SCAN SAMPLE. Record
result in ppm as Reading A.
13. Remove tube from colorimeter. Add 3 drops *DDC Reagent (4034). Cap
and mix.
14. Insert tube into chamber, close lid and select SCAN SAMPLE. Record
result in ppm as Reading B.
15. Calculate result:
Lead (ppm) = Reading A
- Reading B
16. Press
OFF to turn the colorimeter off or press EXIT to exit to a previous
menu or make another menu selection.
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.
Lead 2/2 Smart2 TEST PROCEDURES 9.10