长江中下游静态水体污染后底泥吸附方式与内源污染治理

用2 10 Pb和13 7Cs确定长江中下游静态水体表层底泥的年代 ,采用SEM方法观察底泥的吸附类型和形态 ,用电子探针和能谱仪等分析其化学成分 ,以底泥的粘土矿物、有机质碎屑和砂矿物吸附程度作为确定底泥污染程度的判别指标 ,认为当底泥中的砂矿物表面吸附污染物形成膜后 ,内源污染严重 ,污染物易重新排放。

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

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.