LaMotte SMART3 Colorimeter - Manual (Page 84)

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.
Ammonia nitrogen is present in various concentrations in many surface and ground
water supplies. Any sudden change in the concentration of ammonia nitrogen
in a water supply is cause for suspicion. A product of microbiological activity,
ammonia nitrogen is sometimes accepted as chemical evidence of pollution when
encountered in natural waters.
Ammonia is rapidly oxidized in natural water systems by special bacterial groups
that produce nitrite and nitrate. This oxidation requires that dissolved oxygen be
available in the water. Ammonia is an additional source of nitrogen as a nutrient
which may contribute to the expanded growth of undesirable algae and other forms
of plant growth that overload the natural system and cause pollution.
APPLICATION: Drinking, surface, and saline waters; domestic and
industrial wastes.
RANGE: 0.00–4.00 ppm Ammonia Nitrogen
MDL: 0.05 ppm
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.
SAMPLE HANDLING &
PRESERVATION:
Ammonia solutions tend to be unstable and should
be analyzed immediately. Sample may be stored for
24 hours at 4°C or 28 days at –20°C.
INTERFERENCES: Sample turbidity and color may interfere. Turbidity
may be removed by a fi ltration procedure. Color
interference may be eliminated by blanking the
instrument with a sample blank.
AMMONIA NITROGEN, Low Range SMART3 Test Procedures 11.10
Test P
rocedures