Hoch Marion, Alonso-Azcarate Jacinto, Lischick Martin
Lehrstuhl für Angewandte Geologie, Universität Erlangen-Nürnberg, Schlossgarten 5, Germany.
Environ Pollut. 2003;123(2):217-27. doi: 10.1016/s0269-7491(02)00402-5.
The sorption behavior of dibutyltin (DBT) to four types of natural clay-rich sediments as a function of pH and salinity was studied. The strongest affinity of DBT was found to the montmorillonite-rich sediment, which is characterized by the highest specific surface area and cation exchange capacity of the four used sediments. Kd values range between 12 and 40 (l/kg) on simulated marine conditions (pH 8, salinity 32%). A maximum of DBT adsorption was found at a salinity of 0% and pH 6. Desorption occurred over the entire studied pH range (4-8) when contaminated sediments interact with butyltin-free water. The maximum of desorption coincided with the minimum of adsorption, and vice versa. The results of DBT adsorption are compared with tributyltin (TBT), and the mechanism of the adsorption process is discussed.
研究了二丁基锡（DBT）在四种富含天然粘土的沉积物上的吸附行为与pH值和盐度的关系。发现DBT对富含蒙脱石的沉积物具有最强的亲和力，该沉积物的特征是在所使用的四种沉积物中具有最高的比表面积和阳离子交换容量。在模拟海洋条件（pH 8，盐度32%）下，分配系数（Kd）值在12至40（l/kg）之间。在盐度为0%和pH值为6时发现DBT吸附量最大。当受污染的沉积物与不含丁基锡的水相互作用时，在整个研究的pH范围（4 - 8）内都会发生解吸。解吸最大值与吸附最小值一致，反之亦然。将DBT的吸附结果与三丁基锡（TBT）进行了比较，并讨论了吸附过程的机制。
