Ammonia nitrogen ~ high range – LaMotte DC1600 Colorimeter User Manual

Page 15

AMMONIA NITROGEN ~ HIGH RANGE

NESSLERIZATION METHOD

CODE 3642

QUANTITY

CONTENTS

CODE

30 mL

Ammonia Nitrogen Reagent #1

V-4797-G

2 x 30 mL

*Ammonia Nitrogen Reagent #2

*V-4798-G

Pipet, 1 mL, plastic

0354

*WARNING: Reagents marked with a * are considered hazardous substances. Material Safety Data Sheets (MSDS) are supplied for

these reagents. For your safety, read label and accompanying MSDS before using.

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 – 3.0 ppm 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.

SAMPLE HANDLING

& PRESERVATION:

Preservation is accomplished by the addition of 2 mL of concentrated H

at 4°C.

INTERFERENCES:

Sample turbidity and color may interfere. Turbidity may be removed by a filtration procedure.

Color interference may be eliminated by adjusting the instrument to 100%T with a sample

blank.