Photochemical degradation of oil products in seawater monitored by 3D excitation emission matrix (EEM) fluorescence spectroscopy: implications for coloured dissolved organic matter (CDOM) studies

Electrooxidation using SnO2–RuO2–IrO2|Ti and IrO2–Ta2O5|Ti anodes as tertiary treatment of oil refinery effluent

“…In addition, two signals with lower fluorescence intensity were identified in Regions 3 (200–220 nm ex/560–600 nm em) and 4 (250–280 nm ex/560–600 nm em). The signal in Region 1 can be associated with the presence of PAHs, such as benzene (225 nm ex/335 nm em), toluene (225 nm ex/280 nm em), and naphthalene (220 nm ex/330 nm em) [79–81]. On the other hand, the signal with high fluorescence in Region 4 can be associated with C 6 H 6 O spiked into the wastewater sample, as it exhibits fluorescence at 270 nm ex/297 nm em [82].…”

Spectroscopic and Photochemical Properties of Secondary Brown Carbon from Aqueous Reactions of Methylglyoxal

“…In addition, quinones such as naphthoquinone are also known to have EEM features in the near-UV and are important products in the oxidation of aromatics, as well as being the major constituents of humics in CDOM . At λ ex < 300 nm, nitrogen-containing heterocycles such as tryptophan (which has an indole side chain) and imidazole are major contributors to the fluorescence in the PLOM region. , However, oil-related products including polycyclic aromatic hydrocarbons (PAHs) also have EEM features in the PLOM region . These are represented by the bracketed regions in the lower, right-hand side of Figure .…”