Differences in Pah Desorption and Sediment Organic Matter Composition Between Non-Vegetated and Recently Vegetated Fuel-Oiled Sediments

Abstract

We assessed the desorption behavior of pyrene, chrysene, phenanthrene, and tri-alkylated (C3) phenanthrene/anthracenes for non-vegetated and recently vegetated (< 2 yrs) fuel-oiled sediments collected from the Indiana Harbor Canal (IHC), Gary, IN. Bulk sediment and humin were analyzed for PAH concentrations, organic matter composition, and PAH desorption behavior. PAH desorption isotherms and kinetics were determined using batch aqueous extractions and a two compartment, first-order kinetic model Vegetated sediments contained more plant carbon and were more nonpolar and less oxidized than non-vegetated sediments. Desorption kinetics indicated that PAH desorption was primarily controlled by a slow PAH-desorbing fraction (F2) of IHC sediments. However, in vegetated sediments, particularly humin, PAH release from a faster PAH-desorbing fraction (F1) increased as did the rates (k2) of PAH desorption from the dominant slow PAH-desorbing fraction (F2). We propose that vegetation provides aliphatic, nonpolar carbon to IHC sediments that facilitates more rapid PAH desorption from bulk sediment and humin.

Cosolubilization synergism occurrence in codesorption of PAH mixtures during surfactant-enhanced remediation of contaminated soil

“…Soil B was collected from the farmland being vegetated for a long time, which may contain polar SOM and enable to dissolve into the aqueous phase during the washing process. Vegetated sediments had observed to contain more polar organic carbon and modern (plant) carbon, which could facilitate desorption of PAHs such as Phe from sediments (Nichols et al, 2008;Nichols and Musella, 2009). In this study, the color of supernatants belonging to Soil B washing systems was brownish-green, different from that attaining to Soil A and pure TX100 solutions, in which the color was transparent.…”

Efficient Separation and Recovery of Petroleum Hydrocarbon from Oily Sludge by a Combination of Adsorption and Demulsification

“…The weak absorption peaks at 780 cm −1 and 860 cm −1 are attributed to benzene derivatives. Therefore, the original OS mainly consists of alkanes, olefins, and aromatic hydrocarbon compounds [ 59 ]. The stretching vibration peaks of alkynes disappear at 3300–3040 cm −1 in the sludge after different treatments.…”