Analysis of Anionic Fluorinated Surfactants

Kissa, Erik

doi:10.1201/9780367813130-8

Cited by 133 publications

(235 citation statements)

References 1 publication

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“…S9 in the supporting information. Here, similar results have been reported when comparing to fitted parameters found in the literature [28,29,35].…”

Section: Napfosupporting

confidence: 92%

“…Similar results for NaPFO have been reported [28,29] shows a minimum in the curve, followed by an increase in surface tension, which is indicative of hydrophobic impurities, as first recognised by Mysels et al [31,32]. CMCs were determined using the same method as previously mentioned, this is also true for calculation of both the surface excess (C cmc ) and the area per molecule (A cmc ), data shown in Table S8 in the supporting information.…”

Section: Properties Of Napfosupporting

confidence: 79%

“…Results from surface tension measurements of NaPFO from this study compared to literature [28,29]. Therefore, it seems that using tensiometric techniques and analysis with the Gibbs adsorption isotherm is not appropriate for accurate detail on the interfacial properties of these technical grade FC surfactants, resulting in unphysical values for both A cmc and C cmc .…”

Section: Tablementioning

confidence: 66%

“…Results from characterisation of the pure research-grade surfactant, sodium perfluorooctanoate (NaPFO) were compared to literature data [28,29].…”

Section: Equilibrium Surface Tensions and Critical Micelle Concentratmentioning

confidence: 99%

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Surface and bulk properties of surfactants used in fire-fighting

Hill

Czajka

Hazell

et al. 2018

Journal of Colloid and Interface Science

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All FC surfactants in this study generate very low surface tensions (< 20 mN m) which are comparable, and in some cases, lower than fully-fluorinated surfactant analogues. The complementary techniques (tensiometry and NR) allowed direct comparison to be made with NaPFO in terms of adsorption parameters such as surface excess and area per molecule. Surface tension data for these technical grade FC surfactants were not amenable to reliable interpretation using the Gibbs adsorption equation, however NR provided reliable results. SANS has highlighted how changes in surfactant head group structure can affect bulk properties. This work therefore provides fresh insight into the structure property relationships of some industrially relevant FC surfactants, highlighting properties which are essential for development of more environmentally friendly replacements.

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“…S9 in the supporting information. Here, similar results have been reported when comparing to fitted parameters found in the literature [28,29,35].…”

Section: Napfosupporting

confidence: 92%

Section: Properties Of Napfosupporting

confidence: 79%

Section: Tablementioning

confidence: 66%

“…Results from characterisation of the pure research-grade surfactant, sodium perfluorooctanoate (NaPFO) were compared to literature data [28,29].…”

Section: Equilibrium Surface Tensions and Critical Micelle Concentratmentioning

confidence: 99%

See 2 more Smart Citations

Surface and bulk properties of surfactants used in fire-fighting

Hill

Czajka

Hazell

et al. 2018

Journal of Colloid and Interface Science

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“…4 Due to their unique chemical properties, PFAAs have been used for decades in numerous industrial and manufacturing processes. 5 Among the PFAAs, perfluoroalkyl carboxylic acids (PFCAs) and perfluoroalkane sulfonic acids (PFSAs) have been produced in the greatest quantities (e.g., approximately 3200-7300 tons of PFCAs were produced globally between 1951 and 2004 6 ). The eight-carbon acids, perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS), as well as polyfluorinated compounds containing a perfluorooctyl group, have been particularly important in commerce.…”

Section: Introductionmentioning

confidence: 99%

Treatment of perfluoroalkyl acids by heat-activated persulfate under conditions representative of in situ chemical oxidation

2018

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Perfluoroalkyl acids (PFAAs) are a class of organic contaminants notable for their extreme persistence. The unique chemical properties of these compounds make them difficult to remove from water using most standard water treatment techniques. To gain insight into the possibility of remediating contaminated groundwater by in situ chemical oxidation with heat-activated persulfate, PFAA removal and the generation of transformation products were evaluated under laboratory conditions. Solution pH had a strong influence on the removal of perfluorooctanoic acid (PFOA), resulting in its transformation into shorter-chain perfluorocarboxylic acids (PFCAs) at pH values below 3. The presence of chloride and aquifer sediments decreased the efficiency of the process by less than 25% under conditions likely to be encountered in drinking water aquifers. Perfluorooctane sulfonic acid (PFOS) was not transformed by heat-activated persulfate under any of the conditions tested. Despite challenges related to the need to manipulate aquifer pH, the possible generation of undesirable short-chain PFCAs and chlorate, and metals mobilization, heat-activated persulfate may be a useful treatment technology for sites contaminated with PFCAs and fluorotelomer-based compounds, including those used in current-generation aqueous film-forming foams.

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Association of Perfluoroalkyl and Polyfluoroalkyl Substances With Adiposity

et al. 2018

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Importance Perfluoroalkyl and polyfluoroalkyl substances (PFASs) are ubiquitous synthetic chemicals that are suspected endocrine disruptors. Objectives To determine the extent to which PFASs are associated with increases in weight and body size and evaluate whether a lifestyle intervention modifies this association. Design, Setting, and Participants This prospective cohort study included 957 individuals who participated in the Diabetes Prevention Program trial, conducted from July 1996 to May 2001, and the Diabetes Prevention Program Outcomes Study, conducted from September 2002 to January 2014. Statistical analysis was conducted from September 1, 2017, to May 25, 2018. Interventions and Exposures The initial lifestyle intervention consisted of training in diet, physical activity, and behavior modification, with the major goals of achieving 7% weight loss with subsequent maintenance and a minimum of 150 minutes per week of physical activity. Participants randomized to placebo received standard information about diet and exercise. A total of 6 plasma PFASs were quantified at baseline and 2 years after randomization, means were calculated from baseline and year 2 concentrations, and means were summed to assess total PFAS burden. Main Outcomes and Measures Weight, waist circumference, and hip girth were measured at baseline and at scheduled visits. Results Of the 957 participants, 625 (65.3%) were women and 731 participants (76.4%) were between 40 and 64 years of age; 481 participants were randomized to the lifestyle intervention and 476 participants were randomized to the placebo arm. The PFAS concentrations were not different by treatment arm and were similar to concentrations reported for the US population in 1999-2000. The association of PFAS and weight change differed by treatment. Each doubling in total PFAS concentration was associated with an increase of 1.80 kg (95% CI, 0.43-3.17 kg; P = .01) from baseline to 9 years after randomization for the placebo group but not the lifestyle intervention group (−0.59 kg; 95% CI, –1.80 to 0.62 kg; P = .34). Similarly, each doubling in PFAS was associated with a 1.03-cm increase in hip girth in the Diabetes Prevention Program trial for the placebo group (95% CI, 0.18-1.88 cm; P = .02) but not the lifestyle intervention group (−0.09 cm; 95% CI, −0.82 to 0.63 cm; P = .80). No associations were observed for changes in mean waist circumference. Conclusions and Relevance Among adults at high risk for diabetes, higher plasma PFAS concentration was associated with increases in weight and hip girth over time, but a lifestyle intervention attenuated these associations. Diet and exercise may mitigate the obesogenic effects of environmental chemicals. Trial Registration ...

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Analysis of Anionic Fluorinated Surfactants

Cited by 133 publications

References 1 publication

Surface and bulk properties of surfactants used in fire-fighting

Surface and bulk properties of surfactants used in fire-fighting

Treatment of perfluoroalkyl acids by heat-activated persulfate under conditions representative of in situ chemical oxidation

Association of Perfluoroalkyl and Polyfluoroalkyl Substances With Adiposity

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