Absorption pattern of sediment in polluted still waters and control of authigenic pollution in the middle and lower Yangtze River

2002 
The patterns of bottom sediment absorbed in the polluted still waters of the middle and lower Yangtze River are observed with the scanning electronic microscope. The chemical components of absorbed pollutants are determined by the electronic probe and X-ray energy spectrometry. The sedimentation rate of the bottom sediment is determined by the 210 Pb and 137 Cs methods. With the absorbing capacity of clay minerals, organic debris, and sand grains of the bottom sediment as the indexes for judgment of the degree of sediment pollution, it is considered that if a coating of absorbed pollutants is formed on the surface of sand grains, the authigenic pollution will become serious, and pollutants will be easily re-discharged.
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