LaMotte SMART Spectro Spectrophotometer - Manual (Page 178)

NITRITE-NITROGEN–LOW RANGE
DIAZOTIZATION METHOD • CODE 3650-SC
QUANTITY CONTENTS CODE
2 x 60 mL * Mixed Acid Reagent *V-6278-H
5 g * Color Developing Reagent *V-6281-C
1 Spoon, 0.1 g, plastic 0699
1 Dispenser Cap 0692
*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 state in 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 preservatives when added to certain foods.
The nitrite concentration of drinking water rarely exceeds 0.1 ppm (mg/L).
APPLICATION: Drinking, surface and saline waters; domestic and industrial
wastes.
RANGE: 0.000–0.800 ppm Nitrite-Nitrogen
METHOD: The compound formed by diazotization of sulfanilamide and
nitrite is coupled with N–(1–naphthyl)–ethylenediamine to
produce a reddish-purple color, which is read
colorimetrically.
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 concentration
less than 1000 times the nitrite-nitrogen concentration;
however, the presence of strong oxidants or reductants may
readily affect nitrite concentrations. High alkalinity (above
600 mg/L) will give low results due to a shift in pH.
SMART SPECTRO TEST PROCEDURES 05.04 Nitrite-Nitrogen–LR 1/2