Environ Pollut 2021 May 15;287:117299. Epub 2021 May 15.
Nicholas School of the Environment, Box 90328, Duke University, Durham, NC, 27708, United States; Department of Civil and Environmental Engineering, Box 90287, 121 Hudson Hall, Duke University, Durham, NC, 27708, United States. Electronic address:
Azobenzene disperse dyes are the fastest-growing class of dyestuffs, yet little is known about dye occurrences, sources, and transformations; azo dyes are also underrepresented in chemical standard catalogs, molecular databases, and mass spectral libraries. Many azo dyes are known to have sensitization, mutagenic, and carcinogenic properties. To fill these knowledge gaps, azo dyes were purified from dyestuffs by Soxhlet extraction and flash chromatography and characterized using ultra-high-performance liquid chromatography (UHPLC) coupled to a high resolution Orbitrap Fusion Lumos mass spectrometer operated in positive electrospray ionization mode, as well as by H and C NMR. Read More