Analytical studies on the oxidative degradation of the reactive textile dye Uniblue A

Oxidative degradation process of organic materials in wastewater is an area of significant current interest. In the case of commercial textile dyes, l ittle is known about the structures of the actual products that can form on ce a dye has been submitted to oxidative conditions. Here, a product analys is approach was applied to identify some of the major early degradation pro ducts of Uniblue A (UBA) when reacted with peroxydisulfate (PDS). UBA is th e vinyl sulfone form and major wastewater constituent of the commercial ant hraquinone textile dye C.I, Reactive Blue 19. Using NMR, LC-MS, and Raman, four reaction products could be identified, and possible reaction pathways are discussed.