Electrochemical treatment of textile dyes and their analysis by high-performance liquid chromatography with diode array detection

Several textile dyes were individually exposed to electrochemical treatment . Chromaticity variation and the formation of degradation products were fol lowed using a UV spectrophotometer and HPLC with diode array detection. Dye s studied belong to the azo (color index, C.I. 15 510), methine (C.I. 48 01 3), indigo (C.I. 73 040), natural (C.I. 75 760) and arylmethane (C.I, 42 00 0) classes. Aliquots of the solutions treated at constant potential were an alyzed and compared with control dye solutions. The final electrolysis solu tions obtained by using different electrode materials: Pt, Ti and diamond p resented different chromatograms. It was found that the novel (in this appl ication) diamond electrode is efficient in studying the degradation of vari ous dyes. Possible fragmentation and molecule moiety rearrangement are prop osed as a result of the electrochemical treatment. (C) 2000 Elsevier Scienc e BN. All rights reserved.