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Adsorption and partition of benzo(a)pyrene on sediments with different particle sizes from the Yellow River |
| XIA Xinghui1, HU Lijuan1, MENG Lihong2 |
| 1.State Key Laboratory of Water Environmental Simulation, School of Environment, Beijing Normal University, Beijing 100875, China; 2.Institute of Tianjin Meteorological Bureau, Tianjin 300074, China |
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Abstract Experiments have been carried out to study the sorption of Benzo(a)pyrene(Bap) on sediment particles from the Yellow River using a batch equilibration technique. Effects of particle size on the adsorption and partition of Bap were investigated with the particle content of 3 g/L. Several significant results were obtained from the study. (1) Isotherms of Bap could be fitted with the dual adsorption-partition model under different particle sizes, and the measured value of the adsorption and partition was in agreement with the theoretical value of the dual adsorption-partition model. (2) When the particle diameter was d "e 0.025 mm, the adsorption was predominant in the sorption of Bap, which accounted for 68.7% 82.4% of the sorption. For the particles with the size of 0.007 mm "e d < 0.025 mm, the adsorption was predominant when the equilibrium concentration of Bap was 0 8.87 μg/L in the water phase; and the partition was predominant when the equilibrium concentration of Bap was higher than 8.87 μg/L in the water phase. When the particle diameter was d<0.007 mm, the partition was predominant. (3) On the point of particle size, the contribution of adsorption to sorption followed the order: d"e0.025 mm > 0.007 mm "dd<0.025 mm > d<0.007 mm . (4) The partition coefficients of Bap in solids with different particle sizes were linearly correlated with the organic content, and the Koc of Bap was about 1.26 x 105 (L/kg).
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Issue Date: 05 June 2007
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