Sorption behavior of phenanthrene in Yangtze estuarine sediments: sequential separation |
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Authors: | Yang Yi Liu Min Wang Lili Fu Jialu Yan Caixia Zhou John L |
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Institution: | a School of Resource and Environmental Sciences, East China Normal University, 3663 Zhongshan North Road, Shanghai 200062, China;b State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 Zhongshan North Road, Shanghai 200062, China |
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Abstract: | In the present study, phenanthrene was chosen as the probe compound for determining the sorption of PAHs in sediments from Yangtze estuary and nearby coastal area, China. Sorption isotherms were fitted well by the Freundlich and dual models, respectively. Selected sediments were further sequentially separated to remove the carbonate and organic carbon (OC). Calculated OC sorption capacity values based on both H2O2 oxidization and 375 °C combustion methods were similar and comparable to the Koc values estimated by the empirical linear sorption equations. Both sorption models and sorption data using sequentially separated samples achieve the similar conclusions: (1) the partition behavior dominated by OC in sediments with foc > 0.01; (2) for sediments with 0.001 < foc < 0.01, OC dominated sorption at relatively high aqueous concentration; whereas mineral phase adsorption dominated sorption at lower concentration especially when Cw/Sw was in the range of 0.0001-0.001 in natural aqueous system. |
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Keywords: | PAH Sorption isotherm Dual model Organic carbon Sequential separation |
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