LaMotte SMART 2 User Manual
Page 199
PROCEDURE
Use COD adapter.
1.
Preheat COD reactor to 100 ±2°C. Follow safety precautions.
2.
Remove caps from two *Total Nitrogen Hydroxide Reagent Tubes (4040).
3.
Use a 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.
4.
Use a 1.0 mL pipet (0354) to add 2.0 mL of Deionized Water (5115PS), or
organic-free water, to one tube. This is the blank.
5.
Use another 1.0 mL pipet (0354) to add 2.0 mL of sample to the other
tube. This is the sample.
6.
Cap both tubes and shake vigorously for 30 seconds.
7.
Place the tubes in the COD reactor for 30 minutes.
8.
After exactly 30 minutes, turn the reactor off. Carefully remove the tubes
from the reactor and allow them to cool to room temperature.
9.
At the end of the cooling 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 62 Nitrogen T)
from TESTING MENU.
13.
Scroll to and select 62 Nitrogen T from the menu.
14.
Carefully remove caps from the digested tubes.
15.
Use a 0.15 g spoon (0727) and a funnel (0459) to add one level measure
of *Total Nitrogen Reagent A Powder (4041). Tap funnel to dispense
powder completely. Cap the tubes and shake for 15 seconds.
16.
Wait 3 minutes.
17.
Remove the caps from the tubes. Add one *Total Nitrogen Reagent B
Tablet (4042) to each tube. Cap the tubes and shake for 45 seconds or
until the tablet disintegrates.
18.
Wait 2 minutes.
19.
Remove the caps from the reacted tubes. Carefully remove the caps from
two *Total Nitrogen Acid Reagent Tubes (4043).
CAUTION: Tubes contain a strong acid.
20.
Use another 1.0 mL pipet (0354) to add 2 mL of digested, treated blank to
one Total Nitrogen Acid Reagent Tube. This is the blank.
21.
Use another 1.0 mL pipet (0354) to add 2 mL of digested, treated sample
to the other Total Nitrogen Acid Reagent Tube. This is the sample.
22.
Cap the tubes and invert 10 times to mix.
CAUTION: The tubes will be hot.
Smart2 TEST PROCEDURES 11.04
Nitrogen, Total 3/4