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Published online 7 November 2005
Published in J Environ Qual 34:2328-2333 (2005)
DOI: 10.2134/jeq2005.0173
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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TECHNICAL REPORTS

Waste Management

HPLC-MSn to Investigate the Oxidative Destruction Pathway of Aromatic Sulfonate Wastes

Fabio Gosetti, Valentina Gianotti, Mauro Ravera and Maria Carla Gennaro*

DISAV–Dipartimento di Scienze dell'Ambiente e della Vita, Università del Piemonte Orientale "A. Avogadro", Spalto Marengo 33-15100 Alessandria, Italy

* Corresponding author (gennaro{at}mfn.unipmn.it)

Received for publication May 9, 2005. The article concerns the problem of destruction and remediation of industrial wastes containing aromatic sulfonates. The effects of an oxidation process induced by thermally activated persulfate in the degradation of 1,5-naphthalenedisulfonate (NDS) are investigated by the use of UV-Vis spectrophotometry, high performance liquid chromatography–mass spectrometry (HPLC-MS) and HPLC-MSn techniques. The results obtained indicated that thermal activation (80°C) of a solution containing NDS and sodium persulfate in a molar ratio equal to 1 leads to the cleavage of the naphthalene structure. Estimated chemical oxygen demand (COD) indicates that when the excess of persulfate is equal to 100, NDS undergoes a mineralization of the order of 90%. A degradation pathway undergone by NDS when thermally activated in the presence of persulfate is proposed.

Abbreviations: amu, atomic mass unit • API, atmospheric pressure ionization • COD, chemical oxygen demand • DEO, direct electrochemical oxidation • ESI, electrospray ionization • HPLC-MS, high performance liquid chromatography–mass spectrometry • MEO, mediated electrochemical oxidation • NDS, 1,5-naphthalendisulfonic acid disodium salt • TEA, triethylamine • TIC, total ion current






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