Nitrite – LaMotte SMART Spectro Spectrophotometer User Manual

Page 176

NITRITE

ZINC REDUCTION • CODE 3694-SC

QUANTITY

CONTENTS

CODE

*Nitrite Spectrophotometric Grade Tablets

*3886A-H

Tablet Crusher

0175

*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.

Nitrite represents an intermediate stage of the nitrogen cycle, usually resulting
from the bacterial decomposition of compounds containing organic nitrogen.
Under aerobic conditions bacteria oxidize ammonia to nitrites; and under
anaerobic conditions, bacteria reduce nitrates to nitrites. Nitrites are often used
as food preservatives. The nitrite concentration of drinking water rarely
exceeds 0.1 ppm.

APPLICATION:

Drinking, surface, and saline waters; domestic and industrial
waters.

RANGE:

0.00–1.25 ppm Nitrite

METHOD:

The compound formed by diazotization of sulfanilamide and
nitrite is coupled with N-(1-naphthyl)-ethylenediamine to
produce a reddish purple color in proportion to the nitrite
concentration.

SAMPLE
HANDLING &
PRESERVATION:

Samples should be analyzed as soon as possible. They may be
stored for 24 to 48 hours at 4°C.

INTERFERENCES:

There are few known interfering substances at
concentrations at less than 1000 times the nitrite-nitrogen
concentration; however, the presence of strong oxidizing
agents or reductants may readily affect nitrite concentrations.

SMART SPECTRO TEST PROCEDURES 04.08

Nitrite-TesTab 1/2