LaMotte SMART3 Colorimeter - Manual (Page 263)

PROCEDURE
Use COD/UDV adapter.
1. Preheat COD reactor to 150 ±2°C. Follow safety precautions.
2. Remove cap from a *Total Phosphorus Acid Reagent Tube (4035). Use a 1.0
mL pipet (0354) to add 5.0 mL of sample.
3. Use the 0.15 g spoon (0727) and a funnel (0459) to add one level measure of
*Digestion Reagent Powder (4036). Tap funnel to dispense powder completely.
Cap tube tightly and shake until powder completely dissolves.
4. Place the tube in the COD reactor for 30 minutes.
5. At the end of the heating period, turn the reactor off. Carefully remove the tube
from the reactor and allow it to cool to room temperature.
6. At the end of the cooling period, press and hold until colorimeter turns
on.
7. Press ENTER to select TESTING MENU.
8. Select ALL TESTS (or another sequence containing 081 Phosphate T LR)
from TESTING MENU.
9. Scroll to and select 081 Phosphate T LR from the menu.
10. Carefully remove the cap from the digested tube. Use another 1 mL pipet
(0354) to add 1.0 mL of *Total Phosphorus LR Hydroxide Reagent (4038) to the
tube. Cap and invert to mix.
11. Wipe the tube with a damp towel to remove fi ngerprints and smudges. Wipe
with a dry towel.
12. Insert the tube into the chamber. Select SCAN BLANK. Remove the tube from
the colorimeter.
13. Use another 1 mL pipet (0354) to add *1.0 mL of Phosphate Acid Reagent (V-
6282). Cap and invert tube to mix.
14. Use the 0.1g spoon (0699) and a funnel (0459) to add one level spoon of
Phosphate Reducing Reagent (V-6283). Tap funnel to dispense powder
completely. Cap tube and shake until powder dissolves.
15. Wait 5 minutes.
16. Wipe the vials with a damp towel to remove fi ngerprints and smudges. Wipe
with a dry towel.
17. Insert the tube into the chamber. Select SCAN SAMPLE. Record the result as
Total Phosphorus in mg/L PO
4
.
18. Press to turn the colorimeter off or press
EXIT
to exit to a previous
menu or make another menu selection.
NOTES: For greater accuracy, use laboratory grade pipets.
SMART3 Test Procedures 11.10 PHOSPHORUS, Total, Low Range
Test P
rocedures