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REMEDIATION OF PERFLUOROOCTYLSULFONATE CONTAMINATION BY IN SITU SEQUESTRATION: DIRECT MONITORING OF PFOS BINDING TO POLYQUATERNIUM POLYMERS
Anderson, E.L., M.P.S. Mousavi, Y.H. Aly, X.V. Chen, M.F. Simcik, and P. Bühlmann.
ACS Omega 4:1068-1076(2019)
This paper aimed to calculate the stoichiometry and strength of PFOS when bound to polyquaternium polymers, which have been shown in laboratory studies to immobilize and concentrate PFOS in situ. Fluorous-phase ion-selective electrodes (ISEs) were used to determine the equilibrium constants characterizing binding of PFOS to poly-(dimethylamine-co-epichlorohydrin) and poly-(diallyldimethylammonium) in simulated groundwater and in soil suspensions. A new method is introduced to interpret potentiometric data for surfactant binding to the charged repeat unit of these polyions by combining a 1:1 binding model with the ISE response model. Data fit the binding model for poly (diallyldimethylammonium) and poly(dimethylamine-co-epichlorohydrin) chloride in soil-free conditions and in the presence of soil from Tinker Air Force Base. When the total PFOS concentration in a soil system is known, knowledge of these PFOS binding characteristics permits quantitative prediction of the mobile (free) and polymer-bound fractions of PFOS as a function of the concentrations of the polyquaternium polymer. https://pubs.acs.org/doi/pdf/10.1021/acsomega.8b03275
ACS Omega 4:1068-1076(2019)
This paper aimed to calculate the stoichiometry and strength of PFOS when bound to polyquaternium polymers, which have been shown in laboratory studies to immobilize and concentrate PFOS in situ. Fluorous-phase ion-selective electrodes (ISEs) were used to determine the equilibrium constants characterizing binding of PFOS to poly-(dimethylamine-co-epichlorohydrin) and poly-(diallyldimethylammonium) in simulated groundwater and in soil suspensions. A new method is introduced to interpret potentiometric data for surfactant binding to the charged repeat unit of these polyions by combining a 1:1 binding model with the ISE response model. Data fit the binding model for poly (diallyldimethylammonium) and poly(dimethylamine-co-epichlorohydrin) chloride in soil-free conditions and in the presence of soil from Tinker Air Force Base. When the total PFOS concentration in a soil system is known, knowledge of these PFOS binding characteristics permits quantitative prediction of the mobile (free) and polymer-bound fractions of PFOS as a function of the concentrations of the polyquaternium polymer. https://pubs.acs.org/doi/pdf/10.1021/acsomega.8b03275
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