title: 2-Amino-5,7-dimethyl-1,8-naphthyridine as a fluorescent reagent for the determination of nitrite.
abstract: A new fluorescent reagent 2-amino-5,7-dimethyl-1,8-naphthyridine (ADMND) was proposed for the determination of trace nitrite. The reaction is based on the diazotization of naphthyridine amine with nitrite to form a diazonium salt that hydrolyzed when boiling to give hydroxyl group substituted naphthyridine. Fluorescence quenching degree of ADMND by nitrite ion is linear in the nitrite concentration range of 1 x 10(-7) to 2.5 x 10(-6)mol l(-1) with a detection limit of 4.06 x 10(-8)mol l(-1). Reaction and determination acidity for nitrite is the same which made the method much simpler compared with the widely accepted fluorescence method with DAN as a fluorescence reagent.
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing 100084, China.
authors.forename: Tian
authors.initials: T
authors.lastname: Chen
authors.forename: Aijun
authors.initials: A
authors.lastname: Tong
authors.forename: Yanmei
authors.initials: Y
authors.lastname: Zhou
mesh_terms: D000838:Anions; D002412:Cations; D005456:Fluorescent Dyes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009287:Naphthyridines / Q000737:chemistry*; D009573:Nitrites / Q000032:analysis*; D013050:Spectrometry, Fluorescence; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: C519059:2-amino-5,7-dimethyl-1,8-naphthyridine; D000838:Anions; D002412:Cations; D005456:Fluorescent Dyes; D009287:Naphthyridines; D009573:Nitrites; D014867:Water