Influence Of Copper And Chromium To The Sorption Of PFOS On Sediment

Perfluorochemicals (PFCs) is a new kind of persistent organic pollutants, which is combined of Perfluoroalkyl acids and Non-ionic PFCs.PFCs has some characteristics like hydrophobic, oleophobic, heatproof, and can significantly reduce the water’s surface tension.Therefore, PFCs has been widly used as surfactants and surface protection agents. To investigate the effect of sediment-specific parameters, different salinity of solutions and various metal cation concentrations on a representative PFCs-Perfluorooctane Sulfonate (PFOS) sorption in marine environment is helpful to evaluate and predict the distribution, transport and ecological risk, and will provide scientific basis for regulation, control, and remediation of PFCs with heavy metal pollution.This article is based on the relationship of organic carbon content and salinity of dilutions in marine environment, as well as [Cu2+] and [Cr3+] in seawater and freshwater with sorption of PFOS on sediment. The main conclusions of this dissertation are as follows:(1) Both sorption capacity and nonlinearity of PFOS increased significantly with increasing organic carbon content and the salinity of dilutions. A good correlation is between the sediment organic carbon content and the Kd values for PFOS. Sorption coefficient of PFOS (log Kd at aqueous concentration of10μg/L) in seawater is approximately15times higher than that in freshwater.(2) It is observed that sorption capacity and nonlinearity of PFOS increased significantly with increasing [Cu2+] in both ocean and freshwater system, especially when the concentration of PFOS is at a low level, while the potentiation is more obviously in seawater. (3)The potentiation could also be find in ocean and freshwater system with[Cr3+], but not that strong as with[Cu2+].The changing rate of sorption coefficients of per log [Cu2+]in freshwater system is almost the same as that in seawater.(4)The enhanced effect of the adsorption of PFOS by[Cu2+]is stronger than[Cr3+]in ocean.The above results provide data to predict and model the transport,distribution and fate of PFOS in various oceans.