LaMotte SMART 2 User Manual
Page 231
PROCEDURE
Use COD 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
ON button until colorimeter
turns on.
10.
Press
ENTER to start.
11.
Press
ENTER to select TESTING MENU.
12.
Select ALL TESTS (or another sequence containing 83 Phos T HR)
from TESTING MENU.
13.
Scroll to and select 83 Phos T HR from the menu.
14.
Wipe the tubes with a damp towel to remove fingerprints and smudges.
Wipe with a dry towel.
15.
Insert the blank tube into the chamber. Select SCAN BLANK. Remove the
blank tube from the colorimeter.
16.
Insert the sample tube into the chamber. Select SCAN SAMPLE. Record
the result as Total Phosphorus in mg/L PO
4
.
17.
Press
OFF button to turn the colorimeter off or press EXIT button to exit
to a previous menu or make another menu selection.
þ NOTE: For greater accuracy, use laboratory grade pipets.
To order reagent refills, order code R-4025.
Smart2 TEST PROCEDURES 2.04
Phosphorus, Total–HR 3/3