Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Analytical Method for Determination of Inorganic Nitrites in Natural Stream Water.
Other Authors
Author Title of a Work
Sam, Daniel.
Publisher Defense Technical Information Center
Year Published 1972
Report Number NOLTR-72-295
OCLC Number 227695297
Subjects (Nitrites. ; Colorimetric analysis) ; (Water pollution. ; Ion exchange. ; Inorganic Chemistry.
Library Call Number Additional Info Location Last
ESBD  D201.2 NOLTR 72-295 CPHEA/PESD Library/Corvallis,OR 08/16/2016 DISPERSAL
Collation 16 pages
Contents Notes
In the report, a method for the determination of submicrogram concentrations of inorganic nitrites in natural stream water by an ion exchange concentration technique followed by spectrophotometric measurement is described. The method involves the initial conversion of the inorganic nitrite to a red azo dye by diazotization with sulfanilic acid and coupling with N-(1-Naphthyl)ethylenediamine dihydrochloride. The inorganic nitrite, formed into an azo dye, is then concentrated in a Dowex 1-X8, 50-100 mesh, anion exchange column, and is then eluted with 60% acetic acid. The color of the azo dye is finally measured in a spectrophotometer at 550 nm in a cell of 10 cm optical length. Concentrations as low as 0.1 micromole/liter of nitrite or 1.4 parts per billion (ppb) of nitrogen can be detected. (Author).