TY - JOUR
T1 - Polychlorinated biphenyl (PCB) partition equilibrium between St. Lawrence River sediments and supercritical fluids
AU - Zhou, W.
AU - Anitescu, G.
AU - Tavlarides, L. L.
N1 - Funding Information:
The authors acknowledge the financial support from the National Institute of Environmental Health Sciences Superfund Basic Research Program, grant no. NIEHS P42 ES-04913.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/4
Y1 - 2004/4
N2 - New reliable and extensive polychlorinated biphenyl (PCB) partition equilibrium data between real world PCB contaminated St. Lawrence River sediments (SLRS) and two supercritical fluids (SCFs), scCO2 and scCO2/5 mol% MeOH, are presented. Three real world SLRS samples with similar physical properties and PCB congener distribution patterns but different PCB concentration levels were used to conduct experiments at 313, 323, and 333 K and SCF densities from 5.5 to 18 mol/l. The experimental results are presented as partition coefficients, K, for 16 PCB congeners and for the total PCBs in the SLRS. The presence of methanol in the SC phase increases PCB desorption, as expected. Two partition equilibrium models are employed to correlate these data sets for each of the two SCFs used. The effects of SCF density on K and the parameters of the models are presented for each PCB congener in both systems of scCO2 and scCO2/MeOH. Preferential desorption is found among the PCB congeners and it is suggested that the partition coefficients increase roughly in the order of PCB molar weight. These models can be used in the design of large scale PCB desorption equipment.
AB - New reliable and extensive polychlorinated biphenyl (PCB) partition equilibrium data between real world PCB contaminated St. Lawrence River sediments (SLRS) and two supercritical fluids (SCFs), scCO2 and scCO2/5 mol% MeOH, are presented. Three real world SLRS samples with similar physical properties and PCB congener distribution patterns but different PCB concentration levels were used to conduct experiments at 313, 323, and 333 K and SCF densities from 5.5 to 18 mol/l. The experimental results are presented as partition coefficients, K, for 16 PCB congeners and for the total PCBs in the SLRS. The presence of methanol in the SC phase increases PCB desorption, as expected. Two partition equilibrium models are employed to correlate these data sets for each of the two SCFs used. The effects of SCF density on K and the parameters of the models are presented for each PCB congener in both systems of scCO2 and scCO2/MeOH. Preferential desorption is found among the PCB congeners and it is suggested that the partition coefficients increase roughly in the order of PCB molar weight. These models can be used in the design of large scale PCB desorption equipment.
KW - PCB congeners
KW - Partition equilibrium
KW - Supercritical fluids
KW - scCO
KW - scCO/methanol
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U2 - 10.1016/S0896-8446(03)00012-3
DO - 10.1016/S0896-8446(03)00012-3
M3 - Article
AN - SCOPUS:1642390052
VL - 29
SP - 31
EP - 42
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
SN - 0896-8446
IS - 1-2
ER -