LaMotte SMART 2 Electronic Soil Lab - Manual (Page 67)

NITRATE-NITROGEN
CADMIUM REDUCTION METHOD CODE 3649-SC
QUANTITY CONTENTS CODE
2 x 60 mL *Mixed Acid Reagent *V-6278-H
5 g *Nitrate Reducing Reagent *V-6279-C
1 Spoon, 0.1g 0699
1 Dispenser cap 0692
*WARNING: Reagents marked with a * are considered to be potential health hazards. To view
or print a Material Safety Data Sheet (MSDS) for these reagents see MSDS CD or
www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail, phone or fax.
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
influential 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 diazotizing
sulfanilamide and coupling with
N-(1 naphthyl)-ethylenediamine dihydrochloride to
form a highly colored azo dye which is measured
colorimetrically.
INTERFERENCES: Strong oxiding and reducing substances interfere.
Low results might be obtained for samples that
contain high concentrations of iron and copper.
SMART2 SOIL MANUAL 1.07 67