Abstract
Adsorption onto solid phases is an important process in controlling the distribution of toxic tributyltin (TBT) compounds in aqueous systems. In the present study, the TBT adsorption onto two types of clay, kaolinite (KGa) and montmorillonite (SWy), as a function of salinity (0, 8, 16, 24, 32‰) was investigated using the conventional batch technique. Experiments were carried out under different pHs (4, 6 and 8). For the different clay types examined, the highest TBT adsorption was found at a salinity of 0‰ and pH 6. In general, the TBT adsorptiondecreased with increasing salinity due to the growing competition with metallic cations to the surface sites of the clay minerals. Only at pH 4, the TBT adsorption onto kaolinite did not show any effect by changing the salinity. This was attributed to the pHZPC of 4.9 determined for the kaolinite sample. The results clearly demonstrated the importanceof identifying and characterizing the sorbents and determining the environmental conditions, in order to predict TBT distribution in natural systems or to compare partitioning coefficients of TBT ontosediment phases from different locations.
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Hoch, M. Assessment of Salinity Variations in TBT Adsorption onto Kaolinite and Montmorillonite at Different pH Levels. Water, Air, & Soil Pollution 152, 349–362 (2004). https://doi.org/10.1023/B:WATE.0000015365.36939.dd
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DOI: https://doi.org/10.1023/B:WATE.0000015365.36939.dd