Endre søk
Begrens søket
1 - 8 of 8
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1. Nascimento, Rodrigo A.
    et al.
    Nunoo, Deborah B. O.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Bizkarguenaga, Ekhine
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Schultes, Lara
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Zabaleta, Itsaso
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi. University of the Basque Country (UPV/EHU), Spain.
    Benskin, Jonathan P.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Spanó, Saulo
    Leonel, Juliana
    Sulfluramid use in Brazilian agriculture: A source of per- and polyfluoroalkyl substances (PFASs) to the environment2018Inngår i: Environmental Pollution, ISSN 0269-7491, E-ISSN 1873-6424, Vol. 242, s. 1436-1443Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    N-Ethyl perfluorooctane sulfonamide (EtFOSA) is a perfluorooctane sulfonate (PFOS) precursor and the active ingredient in sulfluramid, a pesticide which is used extensively in Brazil for management of leaf cutting ants. Here we investigate the occurrence of EtFOSA, PFOS, and other per- and polyfluoroalkyl substances (PFASs) in soil, eucalyptus leaves, water (ground, riverine, and coastal (estuarine/marine)) and coastal sediment from an agricultural region of Bahia State, Brazil. This area contains a larger number of eucalyptus plantations where sulfluramid is suspected to be applied. Soil, leaves, and coastal water (marine/estuarine) contained Sigma PFAS concentrations of up to 5400 pg g(-1), 979 pg g(-1), and 1020 pg L-1, respectively, with PFAS profiles generally dominated by PFOS and perfluorooctane sulfonamide (FOSA). Coastal sediment contained Sigma PFAS concentrations of up to 198 pg g(-1), with PFOS, FOSA, and perfluorooctanoic acid (PFOA) being the most frequently observed PFASs. These substances are all potential EtFOSA transformation products, pointing to sulfluramid as a possible source. In riverine water, Sigma PFAS concentrations of up to 8930 pg L-1 were observed. PFOS and PFOA were detected in all river water samples. Groundwater also exhibited PFAS contamination (5730 pg L-1 EPFAS5), likely from sulfluramid use. The observation of other PFASs (e.g. perfluorobutanoic acid) in freshwater suggests that other PFAS sources (in addition to sulfluramid) may be important in this region. Overall, these data support the hypothesis that sulfluramid use contributes to the occurrence of PFASs in the Brazilian environment.

  • 2.
    Schellenberger, Steffen
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Jönsson, Christina
    Mellin, Pelle
    Levenstam, Oscar
    liagkouridis, Ioannis
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Ribbenstedt, Anton
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Hanning, Anne-Charlotte
    Schultes, Lara
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Persson, Caiza
    Plassmann, Merle
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Benskin, Jonathan
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Cousins, Ian
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Release of side-chain fluorinated polymer-containing microplastic fibers from functional textiles during washing and first estimates of perfluoroalkyl acid emissionsInngår i: Artikkel i tidsskrift (Fagfellevurdert)
  • 3.
    Schultes, Lara
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Fluorine mass balance in wildlife and consumer products: How much organofluorine are we missing?2019Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Per- and polyfluoroalkyl substances (PFASs) are a class of anthropogenic pollutants. Many PFASs are highly persistent and have been linked to adverse effects in humans. According to latest estimates, there are more than 4700 PFASs in global commerce, which poses immense challenges for environmental monitoring. This thesis aims at the development, validation and application of total fluorine (TF) and extractable organic fluorine (EOF) methods to consumer products and wildlife in order to estimate the fraction of unidentified organic fluorine in these samples via fluorine mass balance calculations.

    Fluoropolymer-coated food packaging materials and reference materials were used in paper I to validate and compare the performance of three different TF methods. Combustion ion chromatography (CIC), particle-induced gamma ray emission spectroscopy (PIGE) and instrumental neutron activation analysis (INAA) revealed excellent analytical agreement and precision under most circumstances. PIGE and INAA had the advantage of being non-destructive, while CIC was favored due to low detection limits. Fluorine mass balance experiments indicated large amounts of unidentified EOF and non-extractable fluorine. Paper II investigated the occurrence of PFASs, EOF and TF in cosmetic products from the Swedish market. In addition to extremely high concentrations (up to 470 µg/g) of polyfluoroalkyl phosphate diesters (diPAPs; perfluoroalkyl acid (PFAA) precursors), unintentionally-added PFAAs were found in a number of products, together with large amounts of unidentified organic fluorine. Human exposure estimates for perfluorooctanoate (PFOA) using the latest dermal uptake coefficients revealed that PFAA exposure via cosmetics may be significant. Paper III evaluated time trends of PFASs, EOF and TF in Baltic cod (Gadus morhua) from 1981 to 2013. Increasing trends were observed for the predominant PFAS perfluorooctane sulfonate (PFOS), as well as for C9-C12 perfluoroalkyl carboxylic acids (PFCAs) at rates of up to 7.7% per year. Declining concentrations were detected for the PFOS precursor perfluorooctane sulfonamide (FOSA), the EOF and its fraction not accounted for by target PFASs, while TF did not show any significant trends. The increasing concentrations of PFAAs despite their production phase-out could be attributed to either direct exposure of cod to legacy PFAAs or to indirect exposure via PFAA-precursor metabolism. Furthermore, negative correlations of certain PFASs with liver somatic index and body length were observed, which play an important role in the under-standing of toxicological effects of PFASs on wildlife. Paper IV studied the distribution of PFASs, EOF and TF in tissues from a Greenland killer whale (Orcinus orca). The sum of target PFAS concentrations was highest in liver (339 ng/g) and lowest in blubber (9.4 ng/g), consistent with other tissue distribution studies in marine mammals. In contrast, TF and EOF concentrations were highest in blubber (1315 and 229 ng/g, respectively), suggesting the presence of high concentrations of one or more presently unidentified fluorinated compounds. With the help of high resolution mass spectrometry-based suspect screening, several PFAS homologue series and individual PFASs not included in target analysis were detected.

  • 4.
    Schultes, Lara
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Peaslee, Graham F.
    Brockman, John D.
    Majumdar, Ashabari
    McGuinness, Sean R.
    Wilkinson, John T.
    Sandblom, Oskar
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Ngwenyama, Ruth A.
    Benskin, Jonathan P.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Total Fluorine Measurements in Food Packaging: How Do Current Methods Perform?2019Inngår i: Environmental Science and Technology Letters, E-ISSN 2328-8930, Vol. 6, nr 2, s. 73-78Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Per- and polyfluoroalkyl substances (PFASs) represent a class of more than 4000 compounds. Their large number and structural diversity pose a considerable challenge to analytical chemists. Measurement of total fluorine in environmental samples and consumer products is therefore critical for rapidly screening for PFASs and for assessing the fraction of unexplained fluorine(i.e., fluorine mass balance). Here we compare three emerging analytical techniques for total fluorine determination: combustion ion chromatography (CIC), particle-induced gamma-ray emission spectroscopy (PIGE), and instrumental neutron activation analysis (INAA). Application of each method to a certified reference material (CRM), spiked filters, and representative food packaging samples revealed good accuracy and precision. INAA and PIGE had the advantage of being nondestructive, while CIC displayed the lowest detection limits. Inconsistencies between the methods arose due to the high aluminum content in the CRM, which precluded its analysis by INAA, and sample heterogeneity (i.e., coating on the surface of the material), which resulted in higher values from the surface measurement technique PIGE compared to the values from the bulk volume techniques INAA and CIC. Comparing CIC-based extractable organic fluorine to target PFAS measurements of food packaging samples by liquid chromatography-tandem mass spectrometry revealed large amounts of unidentified organic fluorine not captured by compound-specific analysis.

  • 5.
    Schultes, Lara
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Sandblom, Oskar
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Broeg, Katja
    Bignert, Anders
    Benskin, Jonathan
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Temporal trends (1981-2013) of per- and polyfluoroalkyl substances and unidentified organofluorine in Baltic codManuskript (preprint) (Annet vitenskapelig)
  • 6.
    Schultes, Lara
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    van Noordenburg, Carmen
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Spaan, Kyra
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Plassmann, Merle
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Roos, Anna
    Benskin, Jonathan
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    High Concentrations of Unidentified Extractable Organofluorine observed in Blubber from a Greenland Killer Whale (Orcinus orca)Manuskript (preprint) (Annet vitenskapelig)
  • 7.
    Schultes, Lara
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Vestergren, Robin
    Volkova, Kristina
    Westberg, Emelie
    Jacobson, Therese
    Benskin, Jonathan P.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Per- and polyfluoroalkyl substances and fluorine mass balance in cosmetic products from the Swedish market: implications for environmental emissions and human exposure2018Inngår i: Environmental Science: Processes & Impacts, ISSN 2050-7887, E-ISSN 2050-7895, Vol. 20, nr 12, s. 1680-1690Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Per- and polyfluoroalkyl substances (PFASs) are a diverse class of >4700 chemicals used in commercial products and industrial processes. Concerns surrounding PFASs are principally due to their widespread occurrence in humans and the environment and links to adverse health effects. One of the lesser known uses for PFASs is in cosmetic products (CPs) which come into contact with the skin (e.g. hair products, powders, sunblocks, etc.). In the present work, thirty-one CPs from five product categories (cream, foundation, pencil, powder and shaving foam) were analyzed for 39 PFASs by liquid chromatography-tandem mass spectrometry, as well as extractable organic fluorine (EOF) and total fluorine (TF) by combustion ion chromatography (CIC). This multi-platform approach enabled determination of the fraction of fluorine accounted for by known PFASs (i.e. fluorine mass balance). Foundations and powders contained 25 different PFASs with the most frequently detected being perfluorinated carboxylic acids (perfluoroheptanoic acid and perfluorohexanoic acid) and polyfluoroalkyl phosphate esters (PAPs). sigma(14)PAP concentrations up to 470 g g(-1) were measured in products listing mixtures of PAPs as an ingredient. For all samples, sigma(39)PFAS concentrations only explained a small fraction of the EOF and TF, pointing to the presence of unknown organic and/or inorganic fluorinated substances, including polymers. While creams, pencil and shaving foams did not contain measurable concentrations of any of the 39 PFASs targeted here, CIC revealed high to moderate TF content. Overall, these data highlight the need for further investigations into the occurrence of PFASs in CPs and their importance with regards to human and environmental exposure.

  • 8.
    Zabaleta, Itsaso
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi. University of the Basque Country (UPV/EHU), Spain.
    Bizkarguenaga, Ekhine
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi. University of the Basque Country (UPV/EHU), Spain.
    Nunoo, Deborah B. O.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Schultes, Lara
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Leonel, Juliana
    Prieto, Ailette
    Zuloaga, Olatz
    Benskin, Jonathan P.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Biodegradation and Uptake of the Pesticide Sulfluramid in a Soil-Carrot Mesocosm2018Inngår i: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 52, nr 5, s. 2603-2611Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    N-ethyl perfluorooctane sulfonamide (EtFOSA) is the active ingredient of Sulfluramid, a pesticide which is used extensively in South America for control of leaf-cutting ants. Despite being a known precursor to perfluorooctanesulfonate (PFOS), the importance of EtFOSA as a source of environmental PFOS remains unclear. In the present work, uptake, leaching, and biodegradation of EtFOSA and its transformation products were assessed over 81 days in soil-carrot (Daucus carota ssp sativus) mesocosms for the first time. Experiments performed in the presence of carrot produced PFOS yields of up to 34% using a technical EtFOSA standard and up to 277% using Grao Forte, a commercial Sulfluramid bait formulation containing 0.0024% EtFOSA. Perfluorooctane sulfonamido acetate (FOSAA), perfluorooctane sulfonamide (FOSA), and perfluorooctanoic acid (PFOA) also formed over the course of the experiments, with the latter substance attributed to the presence of perfluorooctanamide impurities. The leachate contained low levels of transformation products and a high FOSA:PFOS ratio, consistent with recent observations in Brazilian surface water. In carrots, the more hydrophilic transformation products (e.g., PFOS) occurred primarily in the leaves, while the more hydrophobic products (e.g., FOSA, FOSAA, and EtFOSA) occurred in the peel and core. Remarkably, isomer-specific analysis revealed that the linear EtFOSA isomer biodegraded significantly faster than branched isomers. These data collectively show that the application of Sulfluramid baits can lead to the occurrence of PFOS in crops and in the surrounding environment, in considerably higher yields than previously thought.

1 - 8 of 8
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf