Sökning: "polychlorinated dibenzo-p-dioxins"

Visar resultat 6 - 10 av 33 avhandlingar innehållade orden polychlorinated dibenzo-p-dioxins.

1. 6. Sources of dioxins and other POPs to the marine environment : Identification and apportionment using pattern analysis and receptor modeling

   Författare :Kristina Sundqvist; Karin Wiberg; Mats Tysklind; Paul Geladi; Miriam Diamond; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; air-water gas exchange; chiral; congener pattern; enantiomer; enantiomeric fraction; fugacity; HCH; hexachlorocyclohexane; homologue profile; indicator congener; isomer pattern; pattern analysis; PCA; PCB; PCDD F; PMF; polychlorinated dibenzofuran; polychlorinated dibenzo-p-dioxin; polychlorinated biphenyl; positive matrix factorization; principal component analysis; receptor modeling; source apportioning; source; source tracing; Environmental chemistry; Miljökemi; Persistent organic compounds; Persistenta organiska föreningar;

   Sammanfattning : In the studies underlying this thesis, various source tracing techniques were applied to environmental samples from the Baltic region. Comprehensive sampling and analysis of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in surface sediments in Swedish coastal and offshore areas resulted in a unique data set for this region. LÄS MER

3. 7. Tracing and apportioning sources of dioxins using multivariate pattern recognition techniques

   Författare :Anteneh Assefa; Mats Professor; Karin Professor; Paul Professor; Patrik Andersson; Shigeki Masunaga; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; polychlorinated dibenzo-p-dioxin; polychlorinated dibenzofuran; positive matrix fac- torization; PMF; principal component analysis; PCA; Baltic Sea; sediment core; PCDD F; sources; marine; fish; environmental half-live; peak year; peak level; temporal trend; spatial variation; coastal; offshore; chemical fingerprint; Environmental Science; miljövetenskap;

   Sammanfattning : High levels of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) in edible fish in the Baltic Sea have raised health concerns in the Baltic region and the rest of Europe. Thus, there are urgent needs to characterize sources in order to formulate effective mitigation strategies. LÄS MER

4. 8. Effects of Varying Combustion Conditions on PCDD/F Formation

   Författare :Johanna Aurell; Stellan Marklund; Sukh Sidhu; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dioxin; formation; PCDD; PCDF; MSW incineration; transient combustion; sulfur; memory effects; quench time; chlorine; combustion; polychlorinated dibenzothiophenes; NO; water; Environmental chemistry; Miljökemi;

   Sammanfattning : Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are by-products emitted from combustion sources such as municipal solid waste (MSW) incineration plants. These organic compounds are recognized as toxic, bioaccumulative and persistent in the environment. LÄS MER

5. 9. Trace analysis of polychlorinated dibenzo-p-dioxines, dibenzofurans and related compounds in environmental matrices

   Författare :Yngve Zebühr; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : In this thesis sample extraction, clean up procedures and quantitative and qualitative analysis of polychlorinated dibenzo-p-dioxins, dibenzofurans and related compounds are discussed, as well as aspects on the sampling of some complex environmental matrices.The matrices are mostly from the aquatic environment but other samples are also dealt with, such as urban and remote air samples, samples from environments with heavy automobile traffic and samples from one municipal incinerator, waste water treatment plants etc. LÄS MER

7. 10. The relationship between fly ash chemistry and the thermal formation of polychlorinated pollutants during waste incineration

   Författare :Duong Ngoc Chau Phan; Stellan Marklund; Bogdan Dlugogorski; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Incinerations; dioxins; PCDD Fs; PCBs; PCNs; flue gas; fly ash; sampling; particle characterization; XPS; XRD; SEM EDX; formation; chlorination; PCA; OPLS; OPLS-DA;

   Sammanfattning : The thermal formation of polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), biphenyls (PCBs), and naphthalenes (PCNs) is a major problem in waste incineration. Ideally, rather than relying on air cleaning systems and treatment techniques, their formation should be minimized or, if possible eliminated. LÄS MER