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- W2096159715 abstract "Octanol-air partition coefficients (Koa) were measured directly for 19 organochlorine (OC) pesticides over the temperature range of 5 to 35°C. Values of log Koa at 25°C ranged over three orders of magnitude, from 7.4 for hexachlorobenzene to 10.1 for 1,1-dichloro-2,2-bis (p-chlorophenyl) ethane. Measured values were compared to values calculated as KowRT/H (where R is the ideal gas constant [8.314 J mol−1 K−1], T is absolute temperature, and H is Henry's law constant) were, in general, larger. Discrepancies of up to three orders of magnitude were observed, highlighting the need for direct measurements of Koa. Plots of Koa versus inverse absolute temperature exhibited a log-linear correlation. Enthalpies of phase transition between octanol and air (ΔHoa) were determined from the temperature slopes and were in the range of 56 to 105 kJ mol−1 K−1. Activity coefficients in octanol (γo) were determined from Koa and reported supercooled liquid vapor pressures (p), and these were in the range of 0.3 to 12, indicating near-ideal solution behavior. Differences in Koa values for structural isomers of hexachlorocyclohexane were also explored. A Koa-based model was described for predicting the partitioning of OC pesticides to aerosols and used to calculate particulate fractions at 25 and −10°C. The model also agreed well with experimental results for several OC pesticides that were equilibrated with urban aerosols in the laboratory. A log-log regression of the particle-gas partition coefficient versus Koa had a slope near unity, indicating that octanol is a good surrogate for the aerosol organic matter." @default.
- W2096159715 created "2016-06-24" @default.
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- W2096159715 date "2002-05-01" @default.
- W2096159715 modified "2023-10-18" @default.
- W2096159715 title "Using measured octanol-air partition coefficients to explain environmental partitioning of organochlorine pesticides" @default.
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- W2096159715 doi "https://doi.org/10.1002/etc.5620210513" @default.
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