| 1. |
- Bergman, Åke, et al.
(författare)
-
Analys av klorparaffiner i bröstmjölk och serum
- 2022
-
Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Klorparaffiner (CP) utgör en stor grupp av polyklorerade alkaner av olika kolkedjelängder och olika kloreringsgrad; kortkedjiga (C10 – C13, SCCP), medellånga (C14 – C17, MCCP) och långa (≥C18, LCCP). CP produceras i mycket stora volymer för användning som additiv (bl.a. som mjukgörare och flamskyddsmedel) i produkter, material och varor. De är globala miljöföroreningar som förekommer i abiotisk miljö, djur och människor. Hypotesen för den studie som nu genomförts är att CP uppvisar olika ackumulationsgrad i blod (serum eller plasma) jämfört med bröstmjölk. Därför har parade prover från 25 kvinnor som donerat blod och bröstmjölk analyserats med avseenden på CP i dessa båda matriser och halterna har jämförts med halter av en PCB-markör, CB-153, samt med 4,4’-DDE. Analyserna visar signifikanta haltskillnader, på fettviktsbasis, av SCCP och MCCP i serum på 22 respektive 6.2 gånger högre koncentrationer än de som uppmätts i bröstmjölken. Data visade även förhöjda halter av såväl vSCCPs (mycket korta CP) som LCCPs i serum jämfört med bröstmjölk men skillnaden i dessa båda fall är inte signifikant säkerställd. Medianhalterna av SCCP, MCCP och LCCP i serum respektive bröstmjölk är: 790, 520 och 16 ng/g fett respektive 36, 63 och 6,0 ng/g fett. 4,4’-DDE och CB-153 är jämförbara i de båda matriserna och ligger på 17 respektive 12 ng/g fett. SCCP är klassificerad som en POP i Stockholmskonventionen men inte MCCP trots höga halter i serum. CP är, oavsett kolkedjelängd, persistenta.
|
|
| 2. |
|
|
| 3. |
|
|
| 4. |
|
|
| 5. |
- Héraly, Frédéric, 1995-, et al.
(författare)
-
Humidity-responsive fiber actuators based on cellulose nanofibrils
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Fiber actuators, particularly valuable in soft robotics and environmental sensing, are at the forefront of smart materials and materials innovation. Torsional and tensile biofiber actuators, notable for their cost-effectiveness and biodegradability, mark a critical gap in the development of next-generation functional materials and devices. To address this gap, this study showcases moisture-responsive actuators made from cellulose nanofibrils (CNFs). It introduces a pioneering torsional actuator, leveraging the hydrophilic nature of CNFs filaments produced through wet-spinning processes. These robust filaments exhibit a mechanical strength of 237.0 MPa, and are twisted to form the high-performance torsional actuator. This torsional actuator demonstrates rapid rotations, achieving up to 1180 revolutions per minute (rpm) within merely 10 seconds of moisture exposure and being durable across multiple cycles. The research here further explores critical factors such as filament morphology and twist density, which significantly impact the performance of this torsional actuator. Additionally, a sheath-run tensile actuator is unveiled, ingeniously combining a moisture-sensitive CNFs layer with a supercoiled nylon core to enhance structural support.
|
|
| 6. |
- Yuan, Bo, et al.
(författare)
-
Accumulation of Chlorinated Paraffins in Moose (Alces alces) from Västmanland
- 2020
-
Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Chlorinated paraffins (CPs) are popular and high-volume-production industrial chemicals.Among the 18 wildlife species, the highest concentrations of CPs were found in moose (muscle) (Yuan et al. 2019), which is in line with a monitoring study on the same area by Jansson et al. (1993) 25 years ago.In this project, very-short-chain (vSCCP), short-chain (SCCP), medium-chain (MCCP), and long-chain(LCCP) chlorinated paraffins have been comprehensively analyzed for studying (1) temporal trend of CPs between 1981 and 2018 in moose from the same sampling site (Grimsö, Västmanland) and (2) the individual, sex, and age variances of CP accumulation in moose.The peak concentration of the legacy SCCPs was 280 ng/g lipid in the year 1993.The peak concentrations of LCCPs were found at the year 1989 and 1993 (73 and 63 ng/g lipid, respectively). This is generally in line with the sediment core records collected from Himmerfjärden and from Rundvik coasts (Yuan et al. 2017), which could reflect the peak importation of CPs.
|
|
| 7. |
- Yuan, Bo, et al.
(författare)
-
Chlorinated Paraffins in Sediment Cores Collected from the Baltic Sea and the Kattegatt – Results from Swedish National Screening programme 2020: Sub report Chlorinated Paraffins
- 2022
-
Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Chlorinated paraffins (CPs) are widely used industrial chemicals e.g., as metal working fluids, rubber additives, flame retardants, etc. These chemicals are multiconstituent mixtures, which are categorized into short-chain (SCCPs), medium-chain (MCCPs), and long-chain mixtures (LCCPs). Only SCCPs have been under regulation as POPs. Spatial and temporal trends of SCCPs, MCCPs, and LCCPs in Swedish marine environment were investigated in the present report. Three sediment cores were collected from the Baltic Sea and from the Kattegatt. CPs and TOC were analyzed in the dated sediment sections and compared with the other three sediment cores collected from the Swedish coastal line in a previous study. Sediments nearby industrial areas showed the highest concentrations of CPs (up to 1400 ng/g d.w.), over 80% of which were MCCPs. The highest concentration of SCCPs (170 ng/g d.w.) was found in the sediments nearby a smelter as well as a recycling facility for electric wastes. Over the past decades, decreasing trends of CPs or relatively consistent levels of MCCPs and LCCPs were found in most sediment cores. However, increasing trends of SCCPs were shown in the sediment cores from the Bothnian Sea and Kattegatt even though the use of SCCPs has been restricted in Sweden and Denmark since 1991. Further studies on source identification are warranted.
|
|
| 8. |
|
|
| 9. |
|
|
