中国南方河流和湖泊沉积物对菲的吸附特性

采用循环吸附/解吸实验法,研究了西湖,滇池,太湖,甬江和钱塘江表层沉积物对菲的吸附特性.结果表明5水域沉积物对菲的吸附行为与沉积物有机碳含量有关,西湖和滇池沉积物对菲的吸附表现出明显不可逆性.研究发现当将总吸附量分解成可逆和不可逆吸附2个部分后,其可逆吸附部分可以很好地用脂/水分配机理进行预测.本工作认为河流和湖泊表层沉积物中的有机碳是控制菲环境行为的一个重要因素,但是其生态风险同时取决于沉积物的不可逆吸附特性.

Sorption Characteristics of Phenanthrene on Sediments from Chinese Southern Rivers and Lakes

The sorption/desorption behavior of phenanthrene in five aquatic sediments from Chinese southern rivers and lakes were studied using multiple cycles of sorption/desorption experiments. The results showed that the sorption of phenanthrene on sediments was proportional to the content of organic carbon and that there were irreversible sorption processes. When the total sorption was separated into reversible and irreversible fractions, reversible sorption of phenanthrene on sediments could be better predicted by its partitioning between water and organic carbon phase. It was concluded that the sediment organic carbon could be the essential factor that controlling the environmental behavior of polycyclic aromatic hydrocarbon in aquatic sediment under study and the ecological risk should associated also with the irreversibility of the sorption processes.