天津永定新河口海区海底表层沉积物的污染

天津滨海分布着广泛的淤泥质海岸。这些淤泥质海岸因附近河流携带大量污染物入海而不同程度地受到了污染。以天津永定新河入海口附近浅海区海底表层沉积物为对象,研究了海底表层沉积物中硫化物、有机碳、石油类、重金属(Cu、Pb、Zn、Cd、Hg)和总铬的含量及其分布规律。利用单项标准指数法对沉积物的污染状况进行了分析。结果表明,沉积物中硫化物污染十分严重,总铬污染较严重,重金属污染轻微,没有有机碳和石油类污染。它们对沉积物污染程度的顺序为硫化物>总铬>Cu>Pb>有机碳>Hg>Cd>Pb>石油类。调查区污染物来源主要是通过永定新河输入的。

Contamination of Seafloor Superficial Sediments in the Yongdingxin River Estuary

Muddy coast is widely distributed in Tianjin littoral zone.It has been contaminated to different extents because of rivers carrying pollutants into the littoral area.The authors are to study the pollutants such as sulfide,organic carbon,petroleum,heavy metal(Cu,Pb,Zn,Cd,and Hg) and total chromium in the superficial sediments.Their contents and distribution are analyzed in the survey area.Then,the pollution conditions of the superficial sediments are appraised by the single standard index method.The conclusions are as follows: the sulfide contamination is the most serious and then the total chromium pollution;the heavy metal pollution is slight and there is no organic carbon and petroleum contamination.The contamination source is the Yongdingxin River.