LaMotte NITRATE/NITRITE TEST KIT NCR-2 - Manual (Page 2)

5. Mix before inserting the tube into the Nitrate-N Comparator (3109).
Match sample color to a color standard. Record as ppm
Nitrate-Nitrogen.
6. To convert to ppm Nitrate (NO
3
), multiply the test result by 4.4.
Record as ppm Nitrate.
NOTE:
To obtain the actual nitrate concentration, follow with
Procedure B and subtract the nitrite reading from the reading
obtained in the nitrate test.
PRO CE DURE B - NI TRITE TEST
1.
Fill the sample bottle (0688) with sample water.
2. Fill test tube (0820) to bottom line (2.5 mL) with water from the
sample bottle.
3. Dilute to top (5.0 mL) line with *Mixed Acid Reagent (V-6278).
Cap and mix.
4. Use the 0.1 g spoon (0699)to add one level measure (avoid any
excess) of *Color Developing Reagent (V-6281). Cap and invert the
tube 50-60 times in one minute. Wait 10 minutes.
5. Mix before inserting the tube into the Nitrate-N Comparator (3109).
Match sample color to a color standard. Record as ppm Nitrite as
Nitrate-Nitrogen.
6. Use the following table to convert reading to Nitrite-Nitrogen.
Record as ppm Nitrite-Nitrogen.
Comparator Reading Divide By
0.5 or less
3.5
0.5-1.5
4.6
over 2.0
5.8
NOTE: If the nitrate-nitrogen reading is higher than 10.0 the sample
can be diluted 1:1 with nitrate and nitrite free water, the test run and
the resultant value obtained multiplied by 2.
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09/11