LaMotte SMART3 Soil Operator's Manual page 96

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NITRATE-NITROGEN
CADMIUM REDUCTION METHOD • CODE 3649-SC
QUANTITY CONTENTS
2 x 60 mL *Mixed Acid Reagent
5 g *Nitrate Reducing Reagent
1 Spoon, 0.1 g, plastic
1 Dispenser Cap
*WARNING: Reagents marked with an * are considered to be potential health hazards.
To view or print a Safety Data Sheet (SDS) for these reagents go to www.lamotte.com.
Search for the four digit reagent code number listed on the reagent label, in the
contents list or in the test procedures. Omit any letter that follows or precedes the four
digit code number. For example, if the code is 4450WT-H, search 4450. To obtain a
printed copy, contact LaMotte by email, phone or fax.
Emergency information for all LaMotte reagents is available from Chem-Tel:
(US, 1-800-255-3924) (International, call collect, 813-248-0585).
Nitrogen is a component of the chlorophyll (green color) in plants, thus giving plants
the rich green color characteristic of a healthy plant. Nitrogen promotes succulence
in forage crops and leafy vegetables. When used at the recommended rates, nitrogen
improves the quality of leaf crops. It also simulates the utilization of phosphorus,
potassium and other essential nutrient elements. The above-ground growth of plants is
enhanced with nitrogen. Nitrogen hastens crop maturity (assuming all other nutrients
are adequately supplied and excessive nitrogen rates are not applied). Nitrogen is very
infl uential in fruit sizing.
RANGE: 0.00–300.00 lb/acre Nitrate Nitrogen
METHOD: Powdered cadmium is used to reduce nitrate to nitrite.
The nitrite that is originally present plus reduced nitrate
is determined by diazotization of sulfanilamide and nitrite
followed by coupling with N-(1 naphthyl)-ethylenediamine
dihydrochloride to form a highly colored azo dye which is
measured colorimetrically.
INTERFERENCES: Nitrite interferes at all levels. Strong oxidizing and reducing
substances interfere. Low results might be obtained for
samples that contain high concentrations of iron and
copper.
Smart3 Soil Test Procedures 9.18
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15
10 20
5 25
0 30
CODE
*V-6278-H
*V-6279-C
0699
0692
NITRATE-NITROGEN
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