Mobility of PAHs, PCBs and TPHs from Fresh and Aged Dredged Sediments

Interaction between polychlorinated biphenyls and dissolved organic matter of different molecular weights from natural and anthropic sources

“…The results show that the interaction between DOM-PCBs depends on the origin of the DOM that defines its physicochemical characteristics (Garrido et al, 2016), for this research it could be evidenced by its hydrophilic nature that the DOM of sector 2 and 3 have an origin mainly anthropic (Badea et al, 2014), distributed mainly in the fraction less than 1 KDa. On the other hand, it was determined that the DOM-PCBs interaction depends on the degree of chlorination of these organic pollutants, which is directly proportional to hydrophobicity (Passatore et al, 2014), determining that PCBs with greater chlorination interact mainly with DOM of larger molecular size, which is consistent with that described by Deb et al, 2011. This information is of great importance, since it shows that DOM of anthropic origin can modify the mobility and availability of PCBs, being responsible for the presence of these pollutants in bodies of water far from sources of contamination (Barra et al, 2005;Charrasse et al, 2018).…”

“…PCBs interact with OM in the soil through the sorption process, whereby PCBs are retained by a hydrophobic fraction of OM (Adeyinka and Moodley, 2019;Nuerla et al, 2013;Badea et al, 2014). Due to the PCB-OM sorption process, contaminants can move through the soil profile and reach both phreatic and surface waters despite poor solubility (Charrasse et al, 2018). The PCB-OM interaction could depend on the position of chlorine atoms in the PCBs, as well as the degree of chlorination (Nuerla et al, 2013).…”