title: HPLC-MSn and GC-MS methods to study sunlight and UV-lamp degradations of 1-amino-5-naphthalene sulfonate.
abstract: HPLC-DAD, HPLC-MS/MS, GC-MS and spectrophotometric methods are employed to investigate the degradation process of sodium 1-amino-5-naphthalene sulfonate (1A5NS) aqueous solutions, when exposed to sunlight and UV-lamp (254 nm) irradiations. Experimental results show that both sunlight and 254 nm UV-lamp irradiations destroy the chemical and give rise to major degradation products, characterised by the same m/z ratios. Degradation times are lower for sunlight irradiation, for which a t(1/2) value of 137.4 min has been evaluated, in comparison with the value of t(1/2) of 26.8 min, observed for UV-lamp irradiation. The degradation pathway and the structures of the degradation products are proposed.
authors.affiliation: Dipartimento di Scienze dell'Ambiente e della Vita, Università del Piemonte Orientale Amedeo Avogadro, Via Bellini 25/G, 15100 Alessandria, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Gianotti
authors.forename: F
authors.initials: F
authors.lastname: Gosetti
authors.forename: S
authors.initials: S
authors.lastname: Polati
authors.forename: M C
authors.initials: MC
authors.lastname: Gennaro
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004784:Environmental Monitoring / Q000379:methods*; D004785:Environmental Pollutants / Q000737:chemistry / Q000528:radiation effects; D052918:Environmental Restoration and Remediation; D008401:Gas Chromatography-Mass Spectrometry; D008956:Models, Chemical; D015394:Molecular Structure; D009282:Naphthalenesulfonates / Q000737:chemistry / Q000528:radiation effects; D010100:Oxygen / Q000737:chemistry; D013472:Sunlight; D014466:Ultraviolet Rays
chemical_list: D004785:Environmental Pollutants; D009282:Naphthalenesulfonates; D010100:Oxygen; C022042:1-naphthylamine-5-sulfonic acid