简介：PCBspollutantsaremeasuredontidal-flatsedimentsofYangtzeestuarybyahighresolutioncapillarycolumngaschromatography(HP6890)equippedwithan63Nielectroncapturedetector(ECD).TheconcentrationtendencyofPCBsisPhragmiteszone＞Scirpuszone＞baremudflats.TherearelinearrelationsbetweenPCBsandTOCand＞63μmgrainsizepercentage(involume).Thelowchlorinatedcongenersmaybemoreimportantthanthehighchlorinatedcongenersinthisarea.PCBsprefertoaccumulateinthesedimentsnearsewageoutletsandPhragmiteszone.Thesediments′PCBspollution(10.7～28.6ng/g,dryweight)intheYangtzeestuarytidal-flatislessseriousthanthatofthemostofotherareasintheworld.Butthedetectedratiois100%,eventheJiuduanshashoalhasdetectedPCBs,somuchattentionshouldbepaidtothisareaforPCBs.