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Effect of Clay Mineralogy on the Partition Coefficients of Perfluoroalkyl Substances
https://orcid.org/0000-0002-1639-699X
https://orcid.org/0000-0002-9959-0025
https://orcid.org/0000-0002-3727-5994
The sorption behavior of 20 per-polyfluoroalkyl substances (PFASs) of varying chain lengths and functional groups was studied with kaolinite, illite, and montmorillonite (as pure clay minerals) at pH 7. The six classes of compounds studied were perfluoroalkyl carboxyl acids, perfluoroalkyl sulfonic acids, alkyl-sulfonamidoacetic acids, fluorotelomer sulfonic acids, alkane sulfonamides, and ether carboxylic acids. The sorption isotherms were obtained using a 0.01 M calcium chloride solution spiked with a multi-solute target PFAS solution, yielding a solute concentration varying from 100 to 400 μg/L. The partition coefficients (K d) of all PFASs varied by molecular weight, degree of fluorine substitution, functional group, and cation-exchange capacity. The measured K d value was larger for longer chain lengths and perfluoroalkyl compounds compared with shorter chain lengths and polyfluoroalkyl compounds. PFASs with sulfonamide functional groups showed the strongest sorption, followed by sulfonic and carboxylic acid functional groups. The K d values for all PFASs were found to correlate with increasing cation-exchange capacity of the clay minerals, with the strongest sorption observed by montmorillonite, followed by illite and kaolinite. A parametric model has been established allowing the prediction of PFAS sorption K d in three different common clay minerals.
The results of this paper will help environmental scientists understand the potential distribution and accumulation of PFASs in the soil−water system.
Effect of Clay Mineralogy on the Partition Coefficients of Perfluoroalkyl Substances
https://orcid.org/0000-0002-1639-699X
https://orcid.org/0000-0002-9959-0025
https://orcid.org/0000-0002-3727-5994
The sorption behavior of 20 per-polyfluoroalkyl substances (PFASs) of varying chain lengths and functional groups was studied with kaolinite, illite, and montmorillonite (as pure clay minerals) at pH 7. The six classes of compounds studied were perfluoroalkyl carboxyl acids, perfluoroalkyl sulfonic acids, alkyl-sulfonamidoacetic acids, fluorotelomer sulfonic acids, alkane sulfonamides, and ether carboxylic acids. The sorption isotherms were obtained using a 0.01 M calcium chloride solution spiked with a multi-solute target PFAS solution, yielding a solute concentration varying from 100 to 400 μg/L. The partition coefficients (K d) of all PFASs varied by molecular weight, degree of fluorine substitution, functional group, and cation-exchange capacity. The measured K d value was larger for longer chain lengths and perfluoroalkyl compounds compared with shorter chain lengths and polyfluoroalkyl compounds. PFASs with sulfonamide functional groups showed the strongest sorption, followed by sulfonic and carboxylic acid functional groups. The K d values for all PFASs were found to correlate with increasing cation-exchange capacity of the clay minerals, with the strongest sorption observed by montmorillonite, followed by illite and kaolinite. A parametric model has been established allowing the prediction of PFAS sorption K d in three different common clay minerals.
The results of this paper will help environmental scientists understand the potential distribution and accumulation of PFASs in the soil−water system.
Effect of Clay Mineralogy on the Partition Coefficients of Perfluoroalkyl Substances
https://orcid.org/0000-0002-1639-699X
https://orcid.org/0000-0002-9959-0025
https://orcid.org/0000-0002-3727-5994
The sorption behavior of 20 per-polyfluoroalkyl substances (PFASs) of varying chain lengths and functional groups was studied with kaolinite, illite, and montmorillonite (as pure clay minerals) at pH 7. The six classes of compounds studied were perfluoroalkyl carboxyl acids, perfluoroalkyl sulfonic acids, alkyl-sulfonamidoacetic acids, fluorotelomer sulfonic acids, alkane sulfonamides, and ether carboxylic acids. The sorption isotherms were obtained using a 0.01 M calcium chloride solution spiked with a multi-solute target PFAS solution, yielding a solute concentration varying from 100 to 400 μg/L. The partition coefficients (K d) of all PFASs varied by molecular weight, degree of fluorine substitution, functional group, and cation-exchange capacity. The measured K d value was larger for longer chain lengths and perfluoroalkyl compounds compared with shorter chain lengths and polyfluoroalkyl compounds. PFASs with sulfonamide functional groups showed the strongest sorption, followed by sulfonic and carboxylic acid functional groups. The K d values for all PFASs were found to correlate with increasing cation-exchange capacity of the clay minerals, with the strongest sorption observed by montmorillonite, followed by illite and kaolinite. A parametric model has been established allowing the prediction of PFAS sorption K d in three different common clay minerals.
The results of this paper will help environmental scientists understand the potential distribution and accumulation of PFASs in the soil−water system.
Effect of Clay Mineralogy on the Partition Coefficients of Perfluoroalkyl Substances
Ahmad, Aamir (Autor:in) / Tian, Kuo (Autor:in) / Tanyu, Burak (Autor:in) / Foster, Gregory D. (Autor:in)
ACS ES&T Water ; 3 ; 2899-2909
08.09.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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