LaMotte SMART Spectro Spectrophotometer - Manual (Page 72)

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.
SMART Spectro Test Procedures 2.11 AMMONIA-NITROGEN, High Range
Test P
rocedures