Premium
Analysis of electrochemical degradation products of sulphonated azo dyes using high‐performance liquid chromatography/tandem mass spectrometry
Author(s) -
Vaněrková Dana,
Sakalis Anastasios,
Holčapek Michal,
Jandera Pavel,
Voulgaropoulos Anastasios
Publication year - 2006
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.2656
Subject(s) - chemistry , chloride , electrochemistry , degradation (telecommunications) , electrolyte , mass spectrometry , ammonium chloride , electrospray ionization , supporting electrolyte , aqueous solution , chromatography , inorganic chemistry , organic chemistry , electrode , telecommunications , computer science
Electrochemical treatment of wastewaters containing azo dyes in the textile industry is a promising approach for their degradation. The monitoring of the course of the decomposition of azo dyes in wastewaters is essential due to the environmental impact of their degradation products. In this work, aqueous solutions of a simple azo dye with a low molecular weight (C.I. Acid Yellow 9) and more complex commercial dye (C.I. Reactive Black 5) were electrochemically treated in a laboratory‐scale electrolytic cell in sodium chloride or ammonium acetate as supporting electrolytes. Ion‐pairing reversed‐phase high‐performance liquid chromatography coupled with negative‐ion electrospray ionization mass spectrometry is applied for the identification of electrochemical degradation products. In addition to simple inorganic salts, the formation of aromatic degradation products obtained due to the cleavage of azo bonds and further degradation reactions is shown, as well as chlorination where sodium chloride is the supporting electrolyte. Degradation mechanisms are suggested for the treatment with sodium chloride as the supporting electrolyte. Copyright © 2006 John Wiley & Sons, Ltd.