OMP in WWTP effluent were quantified by high pressure liquid
chromatography (2.5 lm XSelect HSS T3 50 2.1 mm column,
Waters, USA) coupled with a tandem mass spectrometer (TSQ
Vantage, Thermo Fisher, USA). OMP were quantified according to
internal deuterized standards for each OMP. UV light absorption
at 254 nm (UV254) was measured with the spectrophotometer
specified above.