[Use of 7-amino-4-methylcoumarin for the spectrophotometric determination of nitrites].
A new reagent of diazotisation, 7-amino-4-methylcoumarin (coumarin 120) is proposed for the spectrophotometric determination of small amounts of nitrite. To obtain molecules with an high absorptivity, the copulation with different aromatic amines is studied. N, N-dimethylaniline leads to the best results, particularly the reproducibility. Under the optimised conditions, a good linearity (between 10 micrograms/l and 200 micrograms/l) and a good reproducibility (2-3%) according to the amount of detected nitrites are obtained.
Zhou
J Y
JY
Laboratoire de Chimie Analytique II, Faculté de Pharmacie, Châtenay-Malabry.
Dauphin
C
C
Hamon
M
M
D000588:Amines; D003374:Coumarins; D009573:Nitrites / Q000032:analysis*; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*
D000588:Amines; D003374:Coumarins; D009573:Nitrites; C028743:7-amino-4-methylcoumarin
Utilisation de la 7-amino 4-méthyl coumarine pour le dosage spectrophotométrique des nitrites.