Colorimetric Method for Determination of Nitrite

Abstract

A method employing sulfanilamide and N-(1-naphthyl)-ethylenediamine dihydrochloride for the determination of nitrite is proposed. These reagents have been found superior to sulfanilic acid and α-naphthylamine, formerly employed, in that the color developed is clearer, reaches its maximum intensity more rapidly, and remains stable for a longer time. A standardized solution of sulfanilamide is substituted for sodium nitrite as a primary standard to obviate the difficulties arising from the instability of the latter. © 1941, American Chemical Society. All rights reserved.