摘要
PCBs pollutants are measured on tidal-flat sediments of Yangtze estuary by a high resolution capillary column gas chromatography ( HP6890 ) equipped with an 63Ni electron capture detector ( ECD ). The concentration tendency of PCBs is Phragmites zone > Scirpus zone > bare mudflats. There are linear relations between PCBs and TOC and > 63μm grain size percentage ( in volume ). The low chlorinated congeners may be more important than the high chlorinated congeners in this area. PCBs prefer to accumulate in the sediments near sewage outlets and Phragmites zone. The sediments’ PCBs pollution ( 10.7 ~ 28.6 ng/g, dry weight ) in the Yangtze estuary tidal-flat is less serious than that of the most of other areas in the world .But the detected ratio is 100%, even the Jiuduansha shoal has detected PCBs, so much attention should be paid to this area for PCBs.
PCBs pollutants are measured on tidal-flat sediments of Yangtze estuary by ahigh resolution capillary column gas chromatography ( HP6890 ) equipped with an ^(63)Ni electroncapture detector (ECD ). The concentration tendency of PCBs is phragmites zone > Scirpus zone > baremudflats. There are linear relations between PCBs and TOC and > 63 μm grain size percentage (involume ). The low chlorinated congeners may be more important than the high chlorinated congeners inthis area. PCBs prefer to accumulate in the sediments near sewage outlets and Phragmites zone. Thesediments' PCBs pollution ( 10.7 ～28.6 ng/g, dry weight ) in the Yangtze estuary tidal-flat is lessserious than that of the most of other areas in the world. But the detected ratio is 100 %, eventhe Jiuduansha shoal has detected PCBs, so much attention should be paid to this area for PCBs.
基金
supported by the National Natural Science Fund of China (No.49871068 and No.40131020)
