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COMPARISON OF SORPTION ENERGTICS FOR HYDROPHOBIC ORGANIC CHEMICALS BY SYNTHETIC AND NATURAL SORBENTS FROM METHANOL/WATER SOLVENT MIXTURES
Citation:
Woodburn, K. B., J. J. Delfino*, P. C. Rao, AND L. S. Lee. COMPARISON OF SORPTION ENERGTICS FOR HYDROPHOBIC ORGANIC CHEMICALS BY SYNTHETIC AND NATURAL SORBENTS FROM METHANOL/WATER SOLVENT MIXTURES. ENVIRONMENTAL SCIENCE & TECHNOLOGY 23(4):407-413, (1989).
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Description:
Reversed-phase liquid chromatography (RPLC) was used to investigate the thermodynamics and mechanisms of hydrophobic organic chemical (HOC) retention from methanol/water solvent mixtures. The enthalpy-entropy compensation model was used to infer that the hydro- phobic sorptive mechanisms were different for polycyclic aromatic hydrocarbons (PAHs) and monohalobenzenes compared with alkylbenzenes in methanol/water RPLC systems. The estimated compensation temperatures (P) for the two retention mechanisms were essentially inde- pendent of the organic cosolvent content (3540% meth- anol by volume) and RPLC chain length (C-2-C-8). Sorption of four PAHs by Webster surface soil from 30/70 methanol/water solution at three temperatures was mea- sured by the batch equilibration technique. A /3 value of 506 K was calculated by using these data and was within the range of /3 values estimated from the RPLC data (471-762 K). This suggests that the sorptive mechanisms were similar for PAH retention by the RPLC sorbents and the Webster soil from the binary mixed solvent.
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COMPARISON OF SORPTION ENERGTICS FOR HYDROPHOBIC ORGANIC CHEMICALS BY SYNTHETIC AND NATURAL SORBENTS FROM METHANOL/WATER SOLVENT MIXTURES
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