LaMotte SMART3 Colorimeter - Manual (Page 267)

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 Deionized Water (5115PS). This is the blank.
3. Remove cap from a *Total Phosphorus Acid Reagent Tube (4035). Use the 1.0
mL pipet (0354) to add 5.0 mL of sample water. This is the sample.
4. Use the 0.15 g spoon (0727) and a funnel (0459) to add one level measure
of *Digestion Reagent Powder (4036) to each tube. Tap funnel to dispense
powder completely. Cap tube tightly and shake until powder dissolves
completely.
5. Place the tubes in the COD reactor for 30 minutes.
6. At the end of the heating period, turn the reactor off. Carefully remove the tubes
from the reactor block and allow them to cool to room temperature.
7. Carefully remove the caps from the digested tubes. Use another 1 mL pipet
(0354) to add 2.0 mL of *Total Phosphorus HR Hydroxide Reagent (4037) to
each tube. Cap and invert to mix.
8. Use the 0.5 mL pipet (0353) to add 0.5 mL *Total Phosphorus HR Indicator
Reagent (4039) to each tube. Cap and invert to mix. Wait 7 minutes.
9. During the waiting period, press and hold until colorimeter turns on.
10. Press ENTER to select TESTING MENU.
11. Select ALL TESTS (or another sequence containing 082 Phosphate T HR)
from TESTING MENU.
12. Scroll to and select 082 Phosphate T HR from the menu.
13. Wipe the tubes with a damp towel to remove fi ngerprints and smudges. Wipe
with a dry towel.
14. Insert the blank tube into the chamber. Select SCAN BLANK. Remove the
blank tube from the colorimeter.
15. Insert the sample tube into the chamber. Select SCAN SAMPLE. Record the
result as Total Phosphorus in mg/L PO
4
.
16. Press to turn the colorimeter off or press
EXIT
to exit to a previous
menu or make another menu selection.
NOTE: For greater accuracy, use laboratory grade pipets.
Test P
rocedures
SMART3 Test Procedures 11.10 PHOSPHORUS, Total, High Range