Remobilization of polycyclic aromatic hydrocarbons during the resuspension of Yangtze River sediments using a particle entrainment simulator.
Remobilization of 16 polycyclic aromatic hydrocarbons (PAHs) during sediment resuspension was investigated using a particle entrainment simulator at shear stress from 0.2 to 0.5Nm(-2), typical of the energy levels present in many tidally driven aquatic environments. The results suggested that desorption from the entrained particles was the primary source of dissolved PAHs. summation operatorPAHs concentrations in particles on volume normalization increased about four times. However, on mass weight basis, summation operatorPAHs concentrations decreased from 6039.74+/-138.28microgkg(-1) to 1665.39+/-112.26microgkg(-1). The same trend was observed for individual PAHs. Dissolved concentrations of PAHs demonstrated significant differences depending on molecular weight and applied shear. The distribution of PAHs between particle and water phase suggested that for three-ring PAHs, the amounts of PAHs in particles were higher than the predicted values during our experiments. This might be due to presence of another active sorbent.
Feng
Jinglan
J
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China. fengj11123@eyou.com
Yang
Zhifeng
Z
Niu
Junfeng
J
Shen
Zhenyao
Z
D002681:China; D004463:Ecology / Q000295:instrumentation / Q000379:methods; D004784:Environmental Monitoring / Q000379:methods*; D005427:Flocculation; D019015:Geologic Sediments / Q000737:chemistry*; D010316:Particle Size; D052638:Particulate Matter; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D045483:Rivers; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*
D052638:Particulate Matter; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical