Anions in non saline waters - Determination of Anions in Natural and Treated Waters - page 228

Numerous other publications have appeared on the application of diazotisation-coupling
to the spectrophotometric determination of nitrite in non saline water. These are reviewed
in Table 2.39.

2.63.1.2 Non-diazotisation spectrophotometric methods

Spectrophotometric methods for the determination of nitrite which are dependent on
colour forming reactions other than diazotisation and

Table 2.39 Diazotisation-coupling systems for the spectrophotometric determination of
nitrite in non saline water

Diazotisation agent Coupling agent Mox

nm

Concn
range

Limit of
detection

Ref.

4-amino-I-
naphthalene
sulphonic acid

1-naphthol 530 3-10µgN - [496]

naphthalene-2,3-
diamine

355 [497]

Sulphanilamide n -(1-naphthyl) ethylene

diamine flow injection
analysis

- - 0.05µM [443]

4 ′ -amino-
acetophenone

N -phenyl-I-
naphthy lamine

618

0.1-4µg L −1

- [498]

4-nitroaniline 1-naphthol - - - [499]

Sulphanilic acid 8-amino-

naphthalene-2-

525 - - [496]