PCB congener sorption to carbonaceous sediment components: Macroscopic comparison and characterization of sorption kinetics and mechanism

Phenomenological and spectroscopic analysis on the effects of sediment ageing and organic carbon on the fate of a PCB congener spiked to sediment

“…The amount of 2-ClBP sorbed to CCS, Q over time can be characterized as a first order reaction with two stages [13]. The model well represents initial fast sorption (Q e, fast ) followed by slow sorption (Q e, slow ) kinetics typically shown for sediments with nonporous organic and dense mineral components [14]. The kinetic parameters are summarized in Table 3.…”

“…Most studies so far have focused on understanding the ensuing results such as sorption isotherm, capacity, and kinetics in various OC component-PCB congener combinations and the treatment capability of various physical, chemical, and biological systems under different environments [2,3,6,7,[10][11][12][13][14][15][16]. Few attempts have been made so far to systematically address the concept of the transport, reaction, and fate of PCBs in aquatic sediments in the presence of target substrates [5].…”

Effect of reaction environments on the reactivity of PCB (2-chlorobiphenyl) over activated carbon impregnated with palladized iron

“…NOM is generally considered as a component favoring for non-reactive absorption of PCBs. We assume absorption of 2-ClBP into NOM and its adsorption onto AC [17]. Most of 2-ClBP molecules added are distributed to RAC due to the high affinity of AC for PCBs while some of them are partitioned to NOM.…”

A feasibility study on Pd/Mg application in historically contaminated sediments and PCB spiked substrates

“…It can be seen that K10 has a very high surface area, more than an order of magnitude higher than Kaolin, the other clay used here and around 40-80 times higher than the two natural sediments in the study. K10 also showed some organic carbon (OC) content (∼0.13%) indicating that it may have a high affinity to PCBs -both due to its high surface area and organic content [2]. The pHs of the two clays were in the acidic range, far removed from the near neutral pHs of the sediments.…”

“…Their inert and hydrophobic nature and high affinity for sediments makes them hard to treat [1,2]. PCBs partition preferentially to organic components of the environment leading to their prevalence in finegrained, organically rich sediments.…”