Abstract:In situ methods for
the sequestration of perfluorooctyl-1-sulfonate (PFOS) that are based
on PFOS binding to polyquaternium polymers were reported previously,
providing an approach to immobilize and concentrate PFOS in situ.
To apply these methods in real life, the concentrations of polymers
that permit efficient sequestration must be determined. This is only
possible if the stoichiometry and strength of PFOS binding to polyquaternium
polymers are known. Here, we report on the use of fluorous-phase ion-selecti… Show more
“…As a result, a better reliability of the potentiometric measurements with fluorous membranes was achieved. The same group presented another advantageous application of perfluoroperhydrophenanthrene-based ISEs for the determination of the equilibrium binding constants of perfluorooctyl-1-sulfonate to poly(dimethylamine- co -epichlorohydrin) and poly(diallyldimethylammonium) in groundwater and in soil suspensions . Perfluorooctyl-1-sulfonate is a pollutant whose removal from the environment can be conducted by its binding to the positively charged functional groups of polyquaternium polymers, and the knowledge of the binding constant is very important for this process.…”
Section: Sensor Materialsmentioning
confidence: 99%
“…In this way, the first membrane plays the role of the solid contact material, while the second one ensures the selectivity to the ion of interest. 112 Perfluorooctyl-1-sulfonate is a pollutant whose removal from the environment can be conducted by its binding to the positively charged functional groups of polyquaternium polymers, and the knowledge of the binding constant is very important for this process. The authors proposed a method allowing one to calculate the binding constants by fitting the potentiometric response curve.…”
“…As a result, a better reliability of the potentiometric measurements with fluorous membranes was achieved. The same group presented another advantageous application of perfluoroperhydrophenanthrene-based ISEs for the determination of the equilibrium binding constants of perfluorooctyl-1-sulfonate to poly(dimethylamine- co -epichlorohydrin) and poly(diallyldimethylammonium) in groundwater and in soil suspensions . Perfluorooctyl-1-sulfonate is a pollutant whose removal from the environment can be conducted by its binding to the positively charged functional groups of polyquaternium polymers, and the knowledge of the binding constant is very important for this process.…”
Section: Sensor Materialsmentioning
confidence: 99%
“…In this way, the first membrane plays the role of the solid contact material, while the second one ensures the selectivity to the ion of interest. 112 Perfluorooctyl-1-sulfonate is a pollutant whose removal from the environment can be conducted by its binding to the positively charged functional groups of polyquaternium polymers, and the knowledge of the binding constant is very important for this process. The authors proposed a method allowing one to calculate the binding constants by fitting the potentiometric response curve.…”
“…To relate K to the experimental data, the binding equilibrium can be combined with experimental observables, as previously reported, 34 resulting in the following equation:…”
Section: Binding Of 1-dodecyl Sulfate To Poly(dimethylamine-coepichlomentioning
Polyquaternium polymers are polycationic polymers that are contained in many hair shampoos and conditioners and are also often added to water to remove organic and inorganic anions by floc formation. While polyquaternium analysis is not trivial, electroanalytical methods have been proposed for their detection using either irreversible emf responses or reversible potential-driven extraction into and out of polymeric sensing membranes. We present here an alternative technique for the determination of a representative polyquaternium polymer, poly(dimethylamine-co-epichlorohydrin) chloride, by equilibrium binding with a singly charged anionic surfactant, 1-dodecyl sulfate. Binding of an anionic surfactant to the polyquaternium polymer simplifies electrochemical detection as the concentration of unbound surfactant can be monitored using the equilibrium Nernstian emf response of ion-exchanger membranes. The latter can be used to determine the nature of the binding interaction and allows for the straightforward determination of polyquaternium polymer concentrations by titration. Fig. 1 Repeat unit structure of poly(dimethylamine-co-epichlorohydrin) chloride.
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