Kvicksilver i abborre från IKEU-, referens- och återförsurningssjöar år 2003. Årsrapport till det nationella programmet för integrerad kalkningseffektuppföljning (IKEU).
Sundbom, M.; Meili, M.; Johansson, A.-M.; Kärrhage, P.
2004
| ITM, SU
Scientific paper
Enantiomeric specificity of methylsulfonyl-PCBs and distribution of bis(4-chlorophenyl) sulfone, PCB, and DDE methyl sulfones in grey seal tissues
Kulmala, M; Laakso, L; Lehtinen, KEJ; Riipinen, I; Dal Maso, M; Anttila, T; Kerminen, VM; Horrak, U; Vana, M; Tammet, H
2004
| Atmos. Chem. Phys.
| 4
(2553-2560)
The formation and growth of atmospheric aerosols depend on several steps, namely nucleation, initial steps of growth and subsequent - mainly condensational - growth. This work focuses on the initial steps of growth, meaning the growth right after nucleation, where the interplay of curvature effects and thermodynamics has a significant role on the growth kinetics. More specifically, we investigate how ion clusters and aerosol particles grow from 1.5 nm to 20 nm ( diameter) in atmospheric conditions using experimental data obtained by air ion and aerosol spectrometers. The measurements have been performed at a boreal forest site in Finland. The observed trend that the growth rate seems to increase as a function of size can be used to investigate possible growth mechanisms. Such a growth rate is consistent with a recently suggested nano-Kohler mechanism, in which growth is activated at a certain size with respect to condensation of organic vapors. The results also imply that charge-enhanced growth associated with ion-mediated nucleation plays only a minor role in the initial steps of growth, since it would imply a clear decrease of the growth rate with size. Finally, further evidence was obtained on the earlier suggestion that atmospheric nucleation and the subsequent growth of fresh nuclei are likely to be uncoupled phenomena via different participating vapors.
Technical report
Seafloor Imaging and Toxicity: Assessment of Risk caused by buried waste (SITAR) : Results of biotoxicity testing and chemical analysis at a dumpsite, a reference site, and a background site : Deliverable 24
This document reports the results of biological effect characterization and chemical analysis of sediment samples collected at a munitions dumpsite, a reference site, and a background site in the Stockholm archipelago (Baltic Sea). The biological effect characterization was carried out by nanoinjection of sediment extracts in newly fertilized fish eggs. Mortality and several types of abnormal development of the larvae were analysed as measures of biotoxicity. Biochemical variables, such as EROD and ECOD induction and AChE inhibition were analysed as measures of sub-lethal toxicity. Chemical analysis with respect to selected PCBs and PAHs was performed on surface sediment from one of the stations at the dumpsite. The report gives a background to the choice of method, a thorough description of the method, results presented in 13 graphs and 2 tables, and an interpretation of these results. The conclusion was that no measurable toxicants were released from the dumped munitions. It should be emphasized, though, that the lack of toxicity is shown only for this relatively small dumpsite and that the results cannot be extrapolated to other (larger) dumpsites.
Presentation abstract
A fugacity model for source determination of the Lake Baikal region pollution with Plychlorinated Biphenyls.
Sofiev, M.; Galperin. M., Maslyaev; A., McLachlan; M. & Wania, F.
2004
Dioxin 2004
Technical report
Den småskaliga vedeldningens betydelse för luftkvaliteten i Lycksele och Växjö.
Johansson, C.; Hansson HC., Ström; J., Hedberg; E., Olivares; G., Karlsson; H., Wideqvist; U., Swietlicki; E., Nilsson; T., Kristensson; A., & Brorström-Lundén
2004
| ITM, SU
| Report No: 133
Technical report
Development of an EU strategy on mercury: Response to Stakeholder Consultation. Commission of the European Communities (DG-ENV.G.2), 6 p. (http://ec.europa.eu/environment/chemicals/mercury/)
2004
| Svensk-Norsk Försurnings- och Kalkningskonferens 2004
Umeå, Sverige
| April 19, 2024
Scientific paper
BETR-World: a geographically explicit model of chemical fate: application to transport of alpha-HCH to the Arctic
Toose, L.; Woodfine, D.G.; MacLeod, M.; Mackay, D.; Gouin, J.
2004
| Environ. Pollut.
| 128
(1-2)
(223-240)
The Berkeley-Trent (BETR)-World model, a 25 compartment, geographically explicit fugacity-based model is described and applied to evaluate the transport of chemicals from temperate source regions to receptor regions (such as the Arctic). The model was parameterized using GIS and an array of digital data on weather, oceans, freshwater, vegetation and geo-political boundaries. This version of the BETR model framework includes modification of atmospheric degradation rates by seasonally variable hydroxyl radical concentrations and temperature. Degradation rates in all other compartments vary with seasonally changing temperature. Deposition to the deep ocean has been included as a loss mechanism. A case study was undertaken for alpha-HCH. Dynamic emission scenarios were estimated for each of the 25 regions. Predicted environmental concentrations showed good agreement with measured values for the northern regions in air, and fresh and oceanic water and with the results from a previous model of global chemical fate. Potential for long-range transport and deposition to the Arctic region was assessed using a Transfer Efficiency combined with estimated emissions. European regions and the Orient including China have a high potential to contribute alpha-HCH contamination in the Arctic due to high rates of emission in these regions despite low Transfer Efficiencies. Sensitivity analyses reveal that the performance and reliability of the model is strongly influenced by parameters controlling degradation rates. (C) 2003 Elsevier Ltd. All rights reserved.
Scientific paper
Simultaneous PCP decomposition and GAC regeneration assisted by MW irradiation.
