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- W2023253939 abstract "We hypothesized that two mechanisms, absorption into natural organic matter and adsorption onto combustion-derived black carbon (BC), act in parallel to bind polycyclic aromatic hydrocarbons (PAHs) to Boston Harbor sediments. To focus on BC-adsorption, we removed the non-BC fraction by combusting near shore sediments at 375 °C for 24 h under air, leaving ca. 16% of the reduced carbon. The isotherm for pyrene sorption onto our combusted sediment was nonlinear with a Freundlich exponent of 0.62 ± 0.12 and a BC-normalized distribution coefficient (μg/kgBC)/(μg/L)n of 106.25±0.14. Pyrene sorption to untreated sediment was reasonably estimated using Kd = foc 104.7 + fBC 106.25 Cw(0.62-1) where foc was the non-BC organic carbon content, 104.7 was the organic carbon-normalized absorption coefficient for pyrene (L/kgoc), fBC was the BC content, and Cw was the dissolved pyrene concentration (μg/L). C/H/N ratios indicated that our environmental BC differed substantially from NIST diesel soot, possibly due to inclusion of larger BC particles from near source atmospheric fallout and urban runoff. The impact of BC on total PAH sorption may explain reports of nonlinear isotherms, Koc values for PAHs that exceed their respective Kow values, and discrepancies in bioavailability between planar and nonplanar sorbates." @default.
- W2023253939 created "2016-06-24" @default.
- W2023253939 creator A5009657112 @default.
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- W2023253939 date "2001-12-01" @default.
- W2023253939 modified "2023-10-10" @default.
- W2023253939 title "Assessing the Combined Roles of Natural Organic Matter and Black Carbon as Sorbents in Sediments" @default.
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- W2023253939 doi "https://doi.org/10.1021/es010953c" @default.
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