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- W2051265439 abstract "Henry’s Law constants (HLCs) of several common, subsurface hydrophobic organic pollutants (HOPs) including trichloroethylene (TCE), perchloroethylene (PCE) and benzene, toluene, ethylbenzene, and o-xylene (BTEX), were measured using a static headspace phase ratio (SHPR) method over a range of temperatures (35, 45, 55, and 65 °C) and experimentally and operationally relevant cyclodextrin (CD) concentrations (0, 10, 20, 50, and 100 g L−1). In aqueous CD solutions, HLC values decrease according to a power law relationship with increasing CD concentration due to an apparent solubility enhancement caused by HOP partitioning to the hydrophobic cavity of CD molecules. The temperature dependence of air−water partitioning under the influence of CD was well described by the van’t Hoff equation for all HOPs tested. A three-phase equilibrium model was used to interpret air−water−CD partitioning data, treating CD as a pseudophase. Our results show that HOP CD−water partition coefficients decrease linearly with increasing temperature. CD−water partition coefficients were generally independent of CD concentration, with a few exceptions. Comparison of our results for hydroxypropyl-β-CD and TCE to those from another study showed several major discrepancies, which were attributed to differences in the experimental methods employed. Our attempt to correlate CD−water partition coefficients with HOP chemical properties indicates that correlations based on individual chemical descriptors (e.g., aqueous solubility, octanol−water partition coefficient, molecular volume or ET (30) polarity index) will not be sufficient to obtain accurate estimates of HOP CD-water partition coefficients for other compounds with differing chemical structures." @default.
- W2051265439 created "2016-06-24" @default.
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- W2051265439 date "2009-03-16" @default.
- W2051265439 modified "2023-10-16" @default.
- W2051265439 title "The Pseudophase Approach to Assessing Chemical Partitioning in Air−Water−Cyclodextrin Systems" @default.
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- W2051265439 doi "https://doi.org/10.1021/es803382z" @default.
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