A gas chromatography-tandem mass spectrometry based method has been developed for multi-determination of 18 polychlorinated biphenyls(including 7 indicator PCBs,and 12 coplanar PCBs) in the meat,head,shell and egg of Macrobrachium nipponense.20 g homogenized samples are extracted by the mixture solution of V(dichloromethane):V(hexane) =(1:1).Then concentrated sulfuric acid is used for the digestion of organic matter.Thereafter,the extracts are cleaned up through SPE florisil column and make it ready for ana...