洪水对河流底泥有机污染物分布的影响

文章结合我国１９９８ 年遭受特大洪水灾害的情况，介绍了美国密西西比河洪水对底泥有机污染物分布影响的研究成果。结果表明洪水前后所有底泥样品中都存在粪醇、多环芳烃（ 包括芘） 、直链烷基苯磺酸盐、多氯联苯和有机氯农药等污染物，浓度一般小于１ ｍｇ／ｋｇ ，其中上游浓度最高。洪水前后各种污染物浓度变化较大。洪水发生后，上游段底泥中芘和多氯联苯的浓度降低而粪醇浓度升高，这表明城市和农业水域中的污染底泥被洪水冲刷至河内并稀释或覆盖原来的底泥。并列举了这一成果给予我们的启示。

Impact of flood on Distribution of Organic Pollutants in River Sediment

Concerning the 1998 extraordinarily serious flood disaster in China,this paper introduces the study of the impact of the 1993 flood on sediment organic pollutants distributions in Mississippi River.The results showed that pollutants such as coprostanol,polynuclear aromatic hydrocarbons induding pyrene,linear alkyl benzene sulfonats,polychlorinated biphenyl,and organochlorine pesticides were all existing in the sediment samples collected before and after the flood.The concentrations were generally<1 mg/kg,and the highest concentrations were found in the upstream.Differences in concertrations before and after the flood were also decreased whereas coprostanol increased in the upstream.These results indicated that the original sediments were diluted or buried by sediments with different organic compound compositions washed in from urban and agricultural portions of the watershed.Some inspirations from this study are also listed in the paper.