Health & Environmental Research Online (HERO)


PFDoA (307-55-1)


139 References Were Found:

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Perfluorooctanesulfonate and related fluorochemicals in human blood from several countries

Authors: Kannan, K; Corsolini, S; Falandysz, J; Fillmann, G; Kumar, KS; Loganathan, BG; Mohd, MA; Olivero, J; Van Wouwe, N; Yang, JH; Aldoust, KM (2004) Environmental Science and Technology 38:4489-4495. HERO ID: 1290849

[Less] Perfluorooctanesulfonyl fluoride based compounds have been used in a wide variety of consumer products, . . . [More] Perfluorooctanesulfonyl fluoride based compounds have been used in a wide variety of consumer products, such as carpets, upholstery, and textiles. These compounds degrade to perfluorooctanesulfonate (PFOS), a persistent metabolite that accumulates in tissues of humans and wildlife. Previous studies have reported the occurrence of PFOS, perfluorohexanesulfonate (PFHxS), perfluorooctanoate (PFOA), and perfluorooctanesulfonamide (PFOSA) in human sera collected from the United States. In this study, concentrations of PFOS, PFHxS, PFOA, and PFOSA were measured in 473 human blood/serum/plasma samples collected from the United States, Colombia, Brazil, Belgium, Italy, Poland, India, Malaysia, and Korea. Among the four perfluorochemicals measured, PFOS was the predominant compound found in blood. Concentrations of PFOS were the highest in the samples collected from the United States and Poland (>30 ng/mL); moderate in Korea, Belgium, Malaysia, Brazil, Italy, and Colombia (3 to 29 ng/mL); and lowest in India (<3 ng/mL). PFOA was the next most abundant perfluorochemical in blood samples, although the frequency of occurrence of this compound was relatively low. No age- or gender-related differences in the concentrations of PFOS and PFOA were found in serum samples. The degree of association between the concentrations of four perfluorochemicals varied, depending on the origin of the samples. These results suggested the existence of sources with varying levels and compositions of perfluorochemicals, and differences in exposure patterns to these chemicals, in various countries. In addition to the four target fluorochemicals measured, qualitative analysis of selected blood samples showed the presence of other perfluorochemicals such as perfluorodecanesulfonate (PFDS), perfluoroheptanoic acid (PFHpA), perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA), perfluorododecanoic acid (PFDoA), and perfluoroundecanoic acid (PFUnDA) in serum samples, at concentrations approximately 5- to 10-fold lower than the concentration of PFOS. Further studies should focus on identifying sources and pathways of human exposure to perfluorochemicals.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Nanoparticles of polyampholyte-surfactant complexes with perfluorododecanoic acid

Authors: Thunemann, AF; Wendler, U; Jaeger, W; Schnablegger, H (2002) HERO ID: 3859536

[Less] Polyampholytes were synthesized and complexed with perfluorododecanoic acid. This produces highly fluorinated . . . [More] Polyampholytes were synthesized and complexed with perfluorododecanoic acid. This produces highly fluorinated water-soluble nanoparticles, which are long-term stable. The polyampholytes are copolymers of styrylmethyl(trimethyl)ammonium chloride, methacrylic acid, and methyl methacrylate having more cationic monomers (28-100 mol %) than anionic monomers (0-16%). The cationic monomers form a complex with perfluorododecanoate ions to create neutral entities that aggregate while the negatively charged methacrylic monomers prevent a macroscopic precipitation such as normally observed in fluorinated complexes. Negatively charged nanoparticles, which have zeta potentials of about -40 mV, are formed as a result of the combined complexation and stabilization. Small-angle X-ray scattering investigations reveal that the particles are anisotropic. For example, disk-shaped particles with a diameter of D greater than or equal to 30 nm and a height of 2.2 nm were formed for a high number of complexing groups (79 mol %). Cylindrical-shaped particles with lengths of H greater than or equal to 25 nm and radii of 1.5 nm were produced for a medium number of complexing groups (57 mol %). Fluorescence spectroscopy with pyrene as the probe was used to determine the critical aggregation concentrations of the particles which are in the range 0.01-0.06 g L-1.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Rapid and reusable copper catalytic system for allylic oxidation of olefins in hexafluoroisopropanol as solvent

Authors: Fache, F; Piva, O (2002) HERO ID: 3859545

[Less] Cu2O mixed with perfluorododecanoic acid C11F23COOH and t-butyl peroxybenzoate in hexafluoroisopropanol . . . [More] Cu2O mixed with perfluorododecanoic acid C11F23COOH and t-butyl peroxybenzoate in hexafluoroisopropanol led to a rapid and reusable catalytic system for the Kharasch-Sosnovsky reaction.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Polyampholyte-dressed micelles of fluorinated and hydrogenated dodecanoic acid

Authors: Thunemann, AF; Sander, K; Jaeger, W; Dimova, R (2002) Langmuir 18:5099-5105. HERO ID: 3759010

[Less] Polyampholytes with alternating cationic and anionic monomers were synthesized and complexed with fatty . . . [More] Polyampholytes with alternating cationic and anionic monomers were synthesized and complexed with fatty acids (dodecanoic acid and perfluorododecanoic acid). The formation of the polyelectrolyte-fatty acid complexes is self-assembled and generates nanoparticles with sizes in the range of 3-5 nm that were named dressed micelles. A defined arrangement of the ionic charges of three polyampholytes was achieved by the copolymerization of a cationic vinyl monomer (N,N'-diallyl-N'N-dimethylammonium chloride) and anionic vinyl monomers (maleamic acid, phenylmaleamic acid, and 4-butylphenylmaleamic acid). The zeta potentials of the polyampholyte dressed micelles were adjusted in the range of -56 to 25 mV. They increase when replacing the alkylated dodecanoic acid by its perfluorinated counterpart, and they also increase when enhancing the hydrophilicity of the polyampholyte. Analytical ultracentrifugation, dynamic light scattering, and isothermal titration calorinietry were used for the characterization of the fluorinated and the hydrogenated complexes.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Mixed Langmuir monolayer of N-(1,1-dihydroperfluorododecyl)-N,N,N-trimethylammonium chloride with perfluorocarboxylic acids

Authors: Rusdi, M; Moroi, Y; Nakamura, S; Shibata, O; Abe, Y; Takahashi, T (2001) Journal of Colloid and Interface Science 243:370-381. HERO ID: 3767041

[Less] Surface pressure (pi)-area (A), surface potential (DeltaV)-area (A), and dipole moment (mu (perpendicular . . . [More] Surface pressure (pi)-area (A), surface potential (DeltaV)-area (A), and dipole moment (mu (perpendicular to))-area (A) isotherms for N(1,1-dihydroperfluorododecyl)-N,N,N-trimethylammonium chloride (C12-TAC) and perfluorododecanoic acid (FC12) on the substrate of 0.01 M sodium chloride at pH 2.0 were investigated at the air-water interface by the Langmuir method and the ionizing electrode method. The temperature dependence of the transition pressure of each component was not larger than that of normal hydrogenated surfactant. The apparent molar entropy, enthalpy, and internal energy changes of phase transition from the disordered to the ordered state were calculated. Surface potentials (AV) were analyzed using the three-layer model proposed by R. J. Demchak and T. Fort (J. Colloid Interface Sci. 46, 191-202, 1974) for FC12 and Gouy-Chapman treatment for C12-TAC. The contributions of the omega -CF3 group and the head group of the vertical component to the dipole moment, mu (perpendicular to), were estimated. The new finding was that the pi -A curves are shifted to an area smaller than a molecular area of two pure components for the mole fraction (x) of perfluorododecanoic acid of x greater than or equal to0.3. The molecular areas negatively deviate from the additivity rule at discrete surface pressures. Assuming a regular surface mixture, the Joos equation (Joos, P, and R. A. Demel, Biochim. Biophys. Acta 183, 447, 1969) for analysis of the collapse pressure of mixed monolayer allowed estimation of the interaction parameter; xi = -4.20 at x less than or equal to0.5 and xi = -0.24 at x>0.5 between two fluorinated amphiphiles. (C) 2001 Academic Press.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Multilayers of perfluorinated fatty acids

Authors: Knochenhauer, G; Penacorada, F; Reiche, J; Barberka, TA; Brehmer, L; Tredgold, RH (1999) HERO ID: 3859542

[Less] We have formed Y layers of perfluorododecanoic acid CF3(CF2)(10)COOH by thermal evaporation in vacuo . . . [More] We have formed Y layers of perfluorododecanoic acid CF3(CF2)(10)COOH by thermal evaporation in vacuo and of perfluorotetradecanoic acid CF3(CF2)(12)COOH by thermal evaporation and by the Langmuir-Blodgett (LB) technique. We have obtained the bilayer spacing of both these materials by X-ray diffraction and have also studied the in-plane structure of these materials by means of grazing incidence diffraction (GID). Computer modelling was used to interpret the results obtained. For the perfluorododecanoic acid, we find two stable untwisted phases at 25 degrees C and a combination of these two predicts both the Bragg peaks arising from the layer structure and the GID results. Our experimental results show that the perfluorotetradecanoic acid exists in the generally accepted helical structure. Computer modelling leads to the conclusion that closely packed perfluorinated chains with 12 or less carbon atoms should exist in an untwisted state while molecules having mon than 12 carbon atoms show the onset of the helical conformation. (C) 1999 Elsevier Science S.A. All rights reserved.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Determination of Perfluorocarboxylates in Groundwater Impacted by Fire-Fighting Activity

Authors: Moody, CA; Field, JA (1999) Environmental Science and Technology 33:2800-2806. HERO ID: 3005573

[Less] BIOSIS COPYRIGHT: BIOL ABS. Perfluorinated surfactants are used in aqueous film forming foam (AFFF) . . . [More] BIOSIS COPYRIGHT: BIOL ABS. Perfluorinated surfactants are used in aqueous film forming foam (AFFF) formulations, which are used to extinguish hydrocarbon-fuel fires. Virtually nothing is known about the occurrence of perfluorinated surfactants in the environment, in particular, at fire-training areas and emergency response sites where AFFF entered groundwater without prior treatment. Strong anion exchange Empore disks were used to extract perfluorocarboxylates from groundwater collected from fire-training facilities locat . The detection of perfluorocarboxylates at field sites after 7-10 years of inactivity indicates their potential utility as markers for delineating groundwater impacted by fire-fighting activity.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Monolayer properties of alkylammonium perfluoroalkanoates on concentrated sodium chloride solution

Authors: Shibata, O; Furuya, H; Moroi, Y; Saito, M; Matuura, R (1998) HERO ID: 3859535

[Less] Surface pressure (pi)- and surface potential (Delta V)-area (A) isotherms for monolayers of alkylammonium . . . [More] Surface pressure (pi)- and surface potential (Delta V)-area (A) isotherms for monolayers of alkylammonium perfluoroalkanoates (CmF2n+1) of four different chains length on pure water and 4.4 M Nacl solution subphase were measured at various temperatures by the Langmuir and the ionizing electrode methods, respectively. We found that the monolayer of CmF2n+1 salts with the total value of m + n equal to 15 is stable at 298.2 K on 4.4 M NaCl subphase. As for butylammonium perfluorododecanoate (C4F23) Of this short-hydro-long-fluoro alkyl chain salts, the pi-A isotherms showed three phase transitions. The surface potential (or the surface dipole moment) changes enabled the estimation of the molecular orientation of the respective alkylammonium perfluoroalkanoate in the monolayer state. From the surface pressure and surface potential-area isotherms (surface dipole moment), we discuss the difference in hydro-fluoro chain lengths on the physical state of the monolayers. (C) 1998 Elsevier Science S.A. All rights reserved.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Mixed Monolayer Properties of Tetradecanoic Acid with n-Perfluorocarboxylic Acids with 10, 12, 14, 16, and 18 Carbon Atoms

Authors: Shibata,; Yamamoto,; Lee,; Sugihara, (1996) Journal of Colloid and Interface Science 184:201-208. HERO ID: 3858682

[Less] Surface pressure (pi) and surface potential (DeltaV)-area (A) isotherms were obtained for mixed monolayers . . . [More] Surface pressure (pi) and surface potential (DeltaV)-area (A) isotherms were obtained for mixed monolayers of different perfluorocarboxylic acids (FCs) with a hydrocarbon fatty acid, tetradecanoic acid (HC14), on a substrate solution of pH 1.0 as a function of compositions in the mixture by employing the Langmuir method and the ionizing electrode method. Data for the mixed monolayers were analyzed in terms of the additivity rule. Judging from Matuo's classification of two-dimensional phase diagrams, our phase diagrams might be classified into three types. The first is a positive azeotrope type; the combinations of tetradecanoic acid (HC14) with perfluorodecanoic acid (FC10) and with perfluorododecanoic acid (FC12) seem miscible with each other. The second is a completely immiscible type; the combination of perfluorotetradecanoic acid (FC14) and tetradecanoic acid. The third might be a eutectic type, to which the combinations of HC14 with FC16 and with FC18 are assigned; they are miscible in the expanded state but immiscible in the condensed state. Furthermore, the data on the mean molecular area, the surface dipole moment, and the phase diagrams constructed enabled us to estimate the molecular orientation of the respective acids in the mixed monolayer state.