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Phenanthrene sorption to environmental black
carbon in sediments from the Song-Liao watershed (China) |
Jinghuan ZHANG,Mengchang HE,Chunye LIN,Ke SUN,Bin MEN,John L. ZHOU, |
State Key Laboratory
of Water Environment Simulation, School of Environment, Beijing Normal
University, Beijing 100875, China; |
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Abstract Black carbon (BC) in ten contaminated sediments from the Song-Liao watershed, NE China, was isolated upon treatments using a combustion method at 375°C, and the isolates’ sorption isotherms for phenanthrene (Phen) were determined. All sorption isotherms were nonlinear and fitted well by the Freundlich model. A negative relation was found between Freundlich sorption nonlinearity parameter (n values) and BC/total organic carbon (TOC) content of the original sediments (r2=0.687, p<0.01), indicating the dominance of BC in Phen sorption nonlinearity. The BC isolates from this industrialized region had n values of 0.342 to 0.505 and logKFOC values of 6.02 to 6.42(μg·kg−1·OC−1)/(μg·L−1) n for Phen. At a given Ce, the BC had higher Koc value than the original sediments, revealing a higher sorption capacity for BC. BC was responsible for 50.0% to 87.3% of the total sorption at Ce=0.05 Sw, clearly indicating the dominance of BC particles in overall sorption of Phen by sediments.
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Keywords
phenanthrene
sorption
black carbon
sediment
Song-Liao watershed
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Issue Date: 05 December 2009
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