LaMotte SMART 3 Electronic Soil Lab - Manual (Page 57)

SMART3 Soil 1.11 57
AMMONIA NITROGEN - HIGH RANGE
NESSLERIZATION METHOD • CODE 3642-SC
QUANTITY CONTENTS CODE
30 mL Ammonia Nitrogen Reagent #1 V-4797-G
2 x 30 mL *Ammonia Nitrogen Reagent #2 *V-4798-G
1 Pipet, 1 mL, plastic 0354
*WARNING: Reagents marked with an * are considered to be potential health
hazards. To view or print a Material Safety Data Sheet (MSDS) for these reagents
go to www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail,
phone or fax.
A fertile soil may be expected to give a low ammonia nitrogen test reading,
unless there has been a recent application of nitrogenous fertilizer in forms other
than the nitrate. The rapid disappearance of ammonia after fertilizer application
indicates the desired transformation of the ammonia to the more available
nitrate compounds. In forest soils, ammonia is the most abundant available
form of nitrogen. If there is a satisfactory rate of nitrogen transformation, the
humus layers of a forest soil will produce very high concentrations of ammonia
nitrogen.
RANGE: 0.00-200.00 lb/acre Ammonia-Nitrogen
METHOD: Ammonia forms a colored complex with Nessler’s
Reagent in proportion to the amount of ammonia
present in the sample. Rochelle salt is added to prevent
precipitation of calcium or magnesium in undistilled
samples.
INTERFERENCES: Sample turbidity and color may interfere. Turbidity may
be removed by filtration procedure. Color interferences
may be eliminated by blanking the instrument with a
sample blank.
Test P
rocedures