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Separation and identification of ethylparaben in all analysed matrices (influent and effluent wastewater, river water and digested sludge). XIC at m/z 165.0557 (0.005-Da mass-window width, black trace) and at m/z 136.0166 (0.005-Da mass-window width, blue trace) in four different matrices (from top to bottom), and respective low-energy and high-energy mass spectra (from left to right) of the peak eluted at 7.0 min
