LaMotte SMART3 Colorimeter - Manual (Page 202)

PROCEDURE
1. Press and hold 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 5mL of sample to the tube.
8. Add 5 mL *Ammonium Chloride Buffer (4032) to fi ll 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 to turn the colorimeter off or press
EXIT
to exit to a previous
menu or make another menu selection.
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.
SMART3 Test Procedures 11.10 LEAD
Test P
rocedures