Nylon 66 filter membranes is used for sample extraction in the analysis of polycyclic musks (HHCB, AHTN, ADBI, AHDI, ATII) and a metabolite of HHCB (HHCB-lactone) in sewage sludge samples using high-resolution gas-chromatography with ion-impact-selective ion monitoring mass spectrometry (HRGC-EI-SIM-MS).