LaMotte SMART Spectro Spectrophotometer - Manual (Page 196)

NITRITE
ZINC REDUCTION TESTAB METHOD • CODE 3694-SC
QUANTITY CONTENTS CODE
50 *Nitrite Spectrophotometric Grade Tablets *3886A-H
1 Tablet Crusher 0175
*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.
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
MDL: 0.025 ppm
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 2.11 NITRITE, TesTab
Test P
rocedures