| 1. |
- Dosis, Ioannis, et al.
(författare)
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Polybrominated diphenyl ethers (PBDEs) in marine sediment of Thermaikos Gulf, Greece
- 2011
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Ingår i: International Journal of Environmental Analytical Chemistry. - : Informa UK Limited. - 0306-7319 .- 1029-0397. ; 91:12, s. 1151-1165
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Tidskriftsartikel (refereegranskat)abstract
- Polybrominated diphenyl ether (PBDE) concentrations were determined in marine sediment samples collected from 7 different locations around Thermaikos Gulf in north Greece. PBDEs were detected in all sampling sites and their average total concentration (Sigma PBDEs) ranged from 0.26 to 4.92 ng g(-1) d.w. Concentrations were an order of magnitude higher in locations outlining the inner part of the Gulf, which were also closer to industrial areas, sewage treatment plant discharges, the city's harbour and landfill area. These findings suggest pollution in the aquatic ecosystem from industrial and urban activities in the area. Congener profiles exhibit predominance of BDE-209, while concentrations of other PBDE congeners were usually lower, when compared to similar studies from other countries globally, indicating that Thermaikos Gulf is among the low-polluted areas. Statistical analysis showed significant differences among the higher polluted sampling stations. Statistically significant differences also existed between sampling stations with high and low PBDE concentrations. Correlations between congeners suggested local contamination sources; however, specific point sources of pollution were not established.
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| 2. |
- Bergman, Åke, et al.
(författare)
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Insamling och kemisk analys av miljöföroreningar i svensk modersmjölk - Resultat från 2008-2010 : Rapport till Naturvårdsverket – 2010-11-24
- 2010
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Projekten, såsom det först formulerades, avsåg insamling av mjölkprover från mödrar boende i Stockholm, Göteborg, Lund respektive Umeå. Redan första året visade det sig svårt att få in prover från samtliga platser varför provinsamlingen 2008 -2010 koncentrerades till Göteborg och Stockholm. Prover från dessa städer har levererats till Naturhistoriska riksmuseet för dokumentering, preparering och lagring. Såväl individuella prover som poolade sådana har analyserats med avsikt att särskilt studera prover från Göteborg på individuell basis. Proverna för 2008 inkluderade 10 individuella prover och fyra homogenat och för prover från 2009/2010, 19 individuella prover samt två homogenat. De kemiska ämnen som analyserades tillhör följande klasser av miljöföroreningar: organiska klorpesticider, polyklorerade bifenyler (PCB) samt polybromerade difenyletrar (PBDE). Antalet enskilda analyter har i första hand avgjorts av ämnenas förekomst i proverna, men de som rapporteras är ett drygt 20-tal ämnen (se nedan).Den i särklass viktigaste miljöföroreningen bland de som här studeras är 4,4’-DDE. Den förekommer i halter mellan 20 och 130 ng/g fett, 2008-2010 i Göteborg medan halten i homogenat från 2007 låg på ca. 185 ng/g fett. I Stockholmsmödrarnas mjölk från 2008 låg halten på 70-80 ng/g fett men 2009/2010 var halten uppe i ca. 150 ng/g fett. De senare värdena ligger i paritet med observerade halter 2003, 2004 och 2007. Variationen är sådan att det inte ter sig finnas någon trend i haltutvecklingen mellan åren. Inte heller någon geografisk trend tycks förekomma, men fördjupade analyser av dessa data krävs för att säkerställa de statistiska observationerna. Övriga klororganiska bekämpningsmedel, inkl. hexaklorbensen (HCB) förekommer i halter som är <10% av 4,4’-DDE. De dominerande PCB-kongenerna är CB-138, -153 och -180 men dessa förekommer i halter som är lägre än 50% av det som 4,4’-DDE förekommer i. Flertalet PCB-kongener förekommer i sub-10 ng/g fett-halter i modersmjölken oavsett ursprungsstad (Göteborg eller Stockholm).ΣPCB-halten ligger i nivå med koncentrationen av 4,4’-DDE. Koncentrationerna av polybromerade difenyletrar (PBDE) är låga. De enskilda PBDE-kongenerna har mestadels halter på under 1 ng/g fett. BDE-209 förekommer mycket sällan i kvantifierbar halt i modersmjölken. Av lägre bromerade difenyletrar dominerar fortfarande BDE-47.Utanför kontraktet tillförs här också data för halter och trender av polyfluorerade kemikalier i modersmjölk från Stockholm 1972 till 2008. De ämnen som analyserats i modersmjölken är perfluorooktansulfonat (PFOS), perfluorohexansulfonat (PFHS) samt perfluorooktansyra (PFOA). Resultaten redovisar entydigt ämnenas uppåtgående trend fram till omkring 2000 varefter koncentrationerna faller.
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| 3. |
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| 4. |
- Lunder, Sonya, et al.
(författare)
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Significantly Higher Polybrominated Diphenyl Ether Levels in Young US Children than in Their Mothers
- 2010
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Ingår i: Environmental Science and Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 44:13, s. 5256-5262
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Tidskriftsartikel (refereegranskat)abstract
- While young children are rarely included in biomonitoring studies, they are presumed to be at greater risk of ingesting environmental contaminants—particularly those that accumulate in foods or shed from consumer products. The widely used fire retardants polybrominated diphenyl ethers (PBDEs) are ubiquitous contaminants in the indoor environment and are widely detected at higher levels in Americans than in individuals from other countries. However, there are only three studies of PBDEs in U.S. children. We hypothesized that PBDEs are present in higher concentrations in young children than their mothers. PBDEs were assessed in blood samples collected concurrently from 20 mothers and their children, ages 1.5 to 4 years. The chemical analyses were performed by GC/MS applying selected ion monitoring. The samples were analyzed for 20 PBDE congeners; 11 were detected. ΣPBDEs for children were typically 2.8 times higher than for mothers, with median child:mother ratios varying from 2 to 4 for individual congeners. In 19 of 20 families studied, children had higher ΣPBDE concentrations than their mothers with significant (p < 0.01) concentration differences for five of the PBDE congeners. Decabromodiphenyl ether (BDE-209) was quantitated in 13 children and 9 mothers. Other studies indicate PBDEs are not elevated at birth, suggesting that early life is an intense period of PBDE intake. Children’s increased hand-to-mouth activity, dietary preferences, and exposures from breast milk may result in greater ingestion of PBDEs than adults. These findings suggest that measurements from adults likely do not reflect exposures to young children despite sharing homes and similar diets.
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| 5. |
- Smedje, Greta, et al.
(författare)
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Flame Retardants in Airplanes
- 2011
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Ingår i: Epidemiology. - : Ovid Technologies (Wolters Kluwer Health). - 1044-3983 .- 1531-5487.
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Konferensbidrag (refereegranskat)
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| 6. |
- Strid, Anna, et al.
(författare)
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Brominated flame retardant exposure of aircraft personnel
- 2014
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Ingår i: Chemosphere. - : Elsevier BV. - 0045-6535 .- 1879-1298. ; 116, s. 83-90
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Tidskriftsartikel (refereegranskat)abstract
- The use of brominated flame retardants (BFRs) such as polybrominated diphenyl ethers (PBDEs) in aircraft is the result of high fire safety demands. Personnel working in or with aircraft might therefore be exposed to several BFRs. Previous studies have reported PBDE exposure in flight attendants and in passengers. One other group that may be subjected to significant BFR exposure via inhalation, are the aircraft maintenance workers. Personnel exposure both during flights and maintenance of aircraft, are investigated in the present study. Several BFRs were present in air and dust sampled during both the exposure scenarios; PBDEs, hexabromocyclododecane (HBCDD), decabromodiphenyl ethane (DBDPE) and 1,2-bis (2,4,6-tribromophenoxy) ethane. PBDEs were also analyzed in serum from pilots/cabin crew, maintenance workers and from a control group of individuals without any occupational aircraft exposure. Significantly higher concentrations of PBDEs were found in maintenance workers compared to pilots/cabin crew and control subjects with median total PBDE concentrations of 19, 6.8 and 6.6 pmol g(-1) lipids, respectively. Pilots and cabin crew had similar concentrations of most PBDEs as the control group, except for BDE-153 and BDE-154 which were significantly higher. Results indicate higher concentrations among some of the pilots compared to the cabin crew. It is however, evident that the cabin personnel have lower BFR exposures compared to maintenance workers that are exposed to such a degree that their blood levels are significantly different from the control group.
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| 7. |
- Strid, Anna, et al.
(författare)
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Neutral and phenolic brominated organic compounds of natural and anthropogenic origin in Northeast Atlantic Greenland shark (Somniosus microcephalus)
- 2010
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Ingår i: Environmental Toxicology and Chemistry. - : Wiley. - 0730-7268 .- 1552-8618. ; 29:12, s. 2653-2659
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Tidskriftsartikel (refereegranskat)abstract
- In the present study, muscle and liver tissue from 10 female Greenland sharks (Somniosus microcephalus) collected in Icelandic waters were analyzed for neutral and phenolic brominated organic compounds, including polybrominated diphenyl ethers (PBDEs) and the structurally related methoxylated (MeO) and hydroxylated (OH) PBDEs. Hydroxylated PBDEs exist both as natural products and as metabolites of the anthropogenic PBDEs, whereas MeO-PBDEs appear to exclusively be of natural origin. Other compounds examined were 2′,6-dimethoxy-2,3′,4,5′-tetrabromodiphenyl ether (2′,6-diMeO-BDE68), 2,2′-dimethoxy-3,3′,5,5′-tetrabromobiphenyl (2,2′-diMeO-BB80), 2,4,6-tribromoanisol (2,4,6-TBA) and 2,4,6-tribromophenol, all of natural origin, although 2,4,6-TBA and its phenolic counterpart may also be of anthropogenic origin. The major brominated organic compound was 6-MeO-BDE47, and ΣMeO-PBDE ranged from 49 to 210 ng/g fat in muscle and from 55 to 200 ng/g fat in liver tissue. Total concentrations of PBDEs were lower than ΣMeO-PBDE, in all but one sample, ranging between 7.3 to 190 and 9.9 to 200 ng/g fat in muscle and liver, respectively, and major congeners were BDE-47, BDE-99, and BDE-100. Polybrominated diphenyl ethers were analyzed using both high- and low-resolution mass spectrometry (MS) as a quality assurance, and the results from this comparison were acceptable. In accordance with previous work on Greenland sharks, no size/age-related accumulation was observed. Differences seen in concentrations were instead assumed to be a reflection of different feeding habits among the individuals. Phenolic compounds were only formed/retained in trace amounts in the Greenland shark. Among the phenolic compounds studied were 6-OH-BDE47, 2′-OH-BDE68, and 2,4,6-tribromophenol, all detected in liver and the latter two in muscle
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| 8. |
- Vikström, Anna C., et al.
(författare)
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Alcohol influence on acrylamide to glycidamide metabolism assessed with hemoglobin-adducts and questionnaire data
- 2010
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Ingår i: Food and Chemical Toxicology. - : Elsevier BV. - 0278-6915 .- 1873-6351. ; 58:3, s. 820-824
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Tidskriftsartikel (refereegranskat)abstract
- Our purpose was to investigate whether alcohol (ethanol) consumption could have an influence on the metabolism of acrylamide to glycidamide in humans exposed to acrylamide through food. We studied a subsample from a population-based case–control study of prostate cancer in Sweden (CAPS). Questionnaire data for alcohol intake estimates was compared to the ratio of hemoglobin-adduct levels for acrylamide and glycidamide, used as a measure of individual differences in metabolism. Data from 161 non-smoking men were processed with regard to the influence of alcohol on the metabolism of acrylamide to glycidamide. A negative, linear trend of glycidamide-adduct to acrylamide-adduct-level ratios with increasing alcohol intake was observed and the strongest association (p-value for trend = 0.02) was obtained in the group of men with the lowest adduct levels (⩽47 pmol/g globin) when alcohol intake was stratified by acrylamide-adduct levels. The observed trend is likely due to a competitive effect between ethanol and acrylamide as both are substrates for cytochrome P450 2E1. Our results, strongly indicating that ethanol influence metabolism of acrylamide to glycidamide, partly explain earlier observations of only low to moderate associations between questionnaire data on dietary acrylamide intake and hemoglobin-adduct levels.
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| 9. |
- Vikström, A.C., et al.
(författare)
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In Vivo Doses of Acrylamide and Glycidamide in Humans after Intake of Acrylamide-Rich Food
- 2011
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Ingår i: Toxicological Sciences. - : Oxford University Press (OUP). - 1096-6080 .- 1096-0929. ; 119:1, s. 41-49
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Tidskriftsartikel (refereegranskat)abstract
- For assessment of cancer risk from acrylamide (AA) exposure through food, the relation between intake from food in humans and the in vivo doses (area under the concentration-time curve, AUC) of AA (AUC-AA) and of its genotoxic metabolite glycidamide (GA) (AUC-GA) is used as a basis for extrapolation between exposure levels and between species. In this study, AA-rich foods were given to nonsmokers: a high intake of 11 mu g AA/kg body weight (bw) and day for 4 days or an extra (medium) intake of 2.5 mu g AA/kg bw and day for a month. Hemoglobin (Hb)-adduct levels from AA and GA, measured in blood samples donated before and after exposures, were used for calculation of AUC-AA and AUC-GA using reaction rate constants for the adduct formation measured in vitro. Both AA- and GA-adduct levels increased about twofold after the periods with enhanced intake. AUC for the high and medium groups, respectively, in nanomolar hours per microgram AA per kilogram bw, was for AA 212 and 120 and for GA 49 and 21. The AA intake in the high group was better controlled and used for comparisons with other data. The AUCs per exposure dose obtained in the present human study (high group) are in agreement with those previously obtained at 10(2) times higher exposure levels in humans. Furthermore, the values of AUC-AA and AUC-GA are five and two times higher, respectively, than the corresponding values for F344 rats exposed to AA at levels as in published cancer bioassays.
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