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- W2076803946 abstract "The observed strong sorption of polycyclic aromatic hydrocarbons (PAHs) to black carbon (BC) presents potential implications for PAH bioaccessibility in soils. The effects of BC on the desorption kinetics and mineralization of phenanthrene in four soils was investigated after 1, 25, 50, and 100 d soil–PAH contact time, using sequential hydroxypropyl-β-cyclodextrin (HPCD) extractions in soils amended with 0, 0.1, 1, and 5% (dry wt. soil) activated charcoal (AC, a form of BC). The rapidly (%Frap) and slowly (%Fslow) desorbing phenanthrene fractions and their rate constants were determined using a first-order two-compartment (biphasic) desorption model. A minimum 7.8-fold decrease in %Frap occurred when AC was increased from 0 to 5%, with a corresponding increase in %Fslow. Desorption rate constants followed the progression krap (% h–1) > kslow (% h–1) and were in the order of 10–1 to 10–2 and 10–3 to 10–4, respectively. Linear regressions between %Frap and the fractions degraded by a phenanthrene-degrading inoculum (%Fmin) indicated that slopes did not approximate 1 at concentrations greater than 0% AC; %Fmin often exceeded %Frap, indicating a fraction of sorbed phenanthrene (%Fslow) remained microbially accessible. Therefore, HPCD-desorption kinetics alone may not be an adequate basis for the prediction of the bioaccessibility of PAHs to microorganisms or bioremediation potential in AC-amended soils." @default.
- W2076803946 created "2016-06-24" @default.
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- W2076803946 date "2012-11-01" @default.
- W2076803946 modified "2023-09-30" @default.
- W2076803946 title "Influence of Activated Charcoal on Desorption Kinetics and Biodegradation of Phenanthrene in Soil" @default.
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- W2076803946 doi "https://doi.org/10.1021/es3025098" @default.
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