Sensitive tests for nitrite through azo-dye formation.
The diazonium cation resulting from the interaction of nitrite with sulphanilic acid is coupled with pyridinols to give red azo-dyes. Compared to many other colour reactions employed for detection of nitrite, the present systems afford greater sensitivity. Many ions do not affect the colour; thus detection and determination are selective. The method is applied in determination of nitrite in water samples.
Garg
B S
BS
Department of Chemistry, University of Delhi, Delhi 110007, India.
Mehta
Y L
YL
Katyal
M
M