The quantification of PCBs extracts in the wastewater, SPM,and sludge samples was performed on an Agilent 6890A gas chromatograph (GC) coupled with 5795C inert mass spectrometer (MS) detector (Agilent Technologies, USA) with an electron impact (EI) ion source.The MS was operated in selective ion monitoring (SIM) mode. Helium was used as carrier gas with flow rate of 1.2 mL/min. Exactly 1