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| - Effect of Fluorotelomer AlcoholChain Length on Aqueous Solubilityand Sorption by Soils
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| - Fluorotelomer alcohols (FTOHs) are a group of polyfluorinatedalkyl chemicals that have been widely studied asprecursors to perfluorocarboxylates such as perfluorooctanoicacid and for which knowledge on their fate in soils issparse. The solubility and sorption by soil of the homologous4:2 to 10:2 FTOHs were measured in water or cosolvent/water solutions. For the smaller 4:2 and 6:2 FTOHs, solubilityand sorption could be measured adequately in aqueoussystems although transformation was apparent evenin γ-irradiated and autoclaved systems. Sorption coefficientsestimated by measuring both sorbed and solution-phaseconcentrations were not significantly affected by thebiotransformation process. The use of cosolvents wasemployed for probing the behavior of the longer-chain FTOHswith limited aqueous solubility. A single log-linearcorrelation between aqueous solubility and modifiedMcGowan molar volumes resulted for the n-alkanols andFTOHs. Soil organic carbon (OC) consistently appeared to bethe key soil property influencing sorption of the FTOHswhile the perfluorocarbon chain length was the dominantstructural feature influencing solubility and sorption.Each CF2 moiety decreased the aqueous solubility by ∼0.78log units (compared to 0.60 log units for each CH2addition in hydrogenated primary alcohols), and increased OC-normalized sorption coefficients (Koc) by ∼0.87 log units.Good log−log linear correlations between Koc andboth octanol−water partition coefficients and solubilitywere observed for the FTOHs.
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