HPLC-MSn and GC-MS methods to study sunlight and UV-lamp degradations of 1 -amino -5 -naphthalene sulfonate

• Published in: Chemosphere (Oxford) 2007-05, Vol.67 (10), p.1993-1999
• Main Authors: GIANOTTI, V, GOSETTI, F, POLATI, S, GENNARO, M. C
• Format: Article
• Language: English
• Subjects: Applied sciences; Biological and physicochemical phenomena; Chromatography, High Pressure Liquid; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Environmental Monitoring - methods; Environmental Pollutants - chemistry; Environmental Pollutants - radiation effects; Environmental Restoration and Remediation; Exact sciences and technology; Gas Chromatography-Mass Spectrometry; Models, Chemical; Molecular Structure; Naphthalenesulfonates - chemistry; Naphthalenesulfonates - radiation effects; Natural water pollution; Oxygen - chemistry; Pollution; Pollution, environment geology; Sunlight; Ultraviolet Rays; Water treatment and pollution
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2006.11.066

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.