A method for determination of 9triazine herbicides residues in aquatic products by gel permeation chromatography-solid phase extraction-gas chromatography tandem mass spectrometry(GPC-SPE-GC-MS/MS)was established.The sample was extracted with ethyl acetate,then cleaned up by gel permeation chromatography and purified by carbon and NH2 solid phase extraction column.The analytes were determinedin selected ion monitoring and quantified by external method.Propazine,atrazine,terbuthylazine,simazine and cyprazine...