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COMPARISON OF SORPTION ENERGETICS FOR HYDROPHOBIC ORGANIC CHEMICALS BY SYNTHETIC AND NATURAL SORBENTS FROM METHANOL/WATER SOLVENT MIXTURES
Citation:
Woodburn, K., L. Lee, P. Suresh, C. Rao, AND J. Delfino. COMPARISON OF SORPTION ENERGETICS FOR HYDROPHOBIC ORGANIC CHEMICALS BY SYNTHETIC AND NATURAL SORBENTS FROM METHANOL/WATER SOLVENT MIXTURES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/081 (NTIS PB90103649), 1989.
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. he enthalpy-entropy compensation model was used to infer that the hydrophobic sorptive mechanisms were different for polycyclic aromatic hydrocarbons (PAHs) and monohalobenzenes compared with alkylbenzenes in methanol/water RPLC systems. he estimated compensation temperatures B for the two retention mechanisms were essentially independent of the organic cosolvent content (35-80% methanol by volume) and RPLC chain length (C-2-C-8). orption of four PAHs by Webster surface soil from 30/70 methanol/water solution at three temperatures was measured by the batch equilibration technique. alue of 506 K was calculated by using these data and was within the range of B values estimated from the RPLC data (47l-762K). his 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 ENERGETICS FOR HYDROPHOBIC ORGANIC CHEMICALS BY SYNTHETIC AND NATURAL SORBENTS FROM METHANOL/WATER SOLVENT MIXTURES