Lamotte SMART3 Colorimeter User Manual download pdf (Page 224)

PROCEDURE

NOTE: Place Dispenser Cap (0692) on *Mixed Acid Reagent (V-6278). Save this

cap for reﬁ ll reagents.

1. Press and hold until colorimeter turns on.

2. Press

ENTER

to select TESTING MENU.

3. Select ALL TESTS (or another sequence containing 067 Nitrite-N LR) from

TESTING MENU.

4. Scroll to and select 067 Nitrite-N LR from menu.

5. Rinse a clean tube (0290) with sample water. Fill to the 10 mL line with sample.

6. Insert tube into chamber, close lid and select SCAN BLANK.

7. Remove tube from colorimeter and pour off 5 mL into a graduated cylinder or

similar. Discard the remaining sample.

8. Pour the 5 mL sample from the graduated cylinder into the colorimeter tube.

Use graduated cylinder or similar to measure 5 mL of *Mixed Acid Reagent (V-

6278) and add to tube. Cap and mix.

9. Use the 0.1 g spoon (0699) to add two measures of *Color Developing

Reagent (V-6281). Cap and mix by gently inverting for 1 minute. Wait 5 minutes

for maximum color development.

10. At the end of the 5 minute waiting period, mix, insert tube into chamber, close

lid and select SCAN SAMPLE. Record result.

11. Press

to turn colorimeter off or press

EXIT

button to exit to a previous

menu or make another menu selection.

NOTE: To convert nitrite-nitrogen (NO

–N) results to ppm nitrite (NO

–

), multiply

results by 3.3.

NITRITE NITROGEN, Low Range SMART3 Test Procedures 11.10

Test Procedures

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Lamotte SMART3 Colorimeter User Manual Page 224