About: Photochemical degradation of PCBs in snow.

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About: Photochemical degradation of PCBs in snow. Goto Sponge NotDistinct Permalink

An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	This work represents the first laboratory study known to the authors describing photochemical behavior of persistent organic pollutants in snow at environmentally relevant concentrations. The snow samples were prepared by shock freezing of the corresponding aqueous solutions in liquid nitrogen and were UV irradiated in a photochemical cold chamber reactor at minus 25 C, in which simultaneous monitoring of snow air exchange processes was also possible. The main photodegradation pathway of two model snow contaminants, PCB 7 and PCB 153 (c 100 ng/kg), was found to be reductive dehalogenation. Possible involvement of the water molecules of snow in this reaction has been excluded by performing the photolyses in D2O snow. Instead, trace amounts of volatile organic compounds have been proposed to be the major source of hydrogen atom in the reduction, and this hypothesis was confirmed by the experiments with deuterated organic co-contaminants, such as d6 ethanol or d8 tetrahydrofuran. This work represents the first laboratory study known to the authors describing photochemical behavior of persistent organic pollutants in snow at environmentally relevant concentrations. The snow samples were prepared by shock freezing of the corresponding aqueous solutions in liquid nitrogen and were UV irradiated in a photochemical cold chamber reactor at minus 25 C, in which simultaneous monitoring of snow air exchange processes was also possible. The main photodegradation pathway of two model snow contaminants, PCB 7 and PCB 153 (c 100 ng/kg), was found to be reductive dehalogenation. Possible involvement of the water molecules of snow in this reaction has been excluded by performing the photolyses in D2O snow. Instead, trace amounts of volatile organic compounds have been proposed to be the major source of hydrogen atom in the reduction, and this hypothesis was confirmed by the experiments with deuterated organic co-contaminants, such as d6 ethanol or d8 tetrahydrofuran. (en)
Title	Photochemical degradation of PCBs in snow. Photochemical degradation of PCBs in snow. (en)
skos:prefLabel	Photochemical degradation of PCBs in snow. Photochemical degradation of PCBs in snow. (en)
skos:notation	RIV/00216224:14310/07:00020846!RIV10-MSM-14310___
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA205/05/0819), Z(MSM0021622412)
http://linked.open...iv/cisloPeriodika	41
http://linked.open...vai/riv/dodaniDat	2010
http://linked.open...aciTvurceVysledku	Matykiewiczová, Nina Klán, Petr Klánová, Jana
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Masarykova univerzita / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	441235
http://linked.open...ai/riv/idVysledku	RIV/00216224:14310/07:00020846
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Photochemistry; Irradiation; Snow; Ice; Persistent organic pollutants; Polychlorinated biphenyls; Hydrogen peroxide. (en)
http://linked.open.../riv/klicoveSlovo	Irradiation Ice Persistent organic pollutants Photochemistry Polychlorinated biphenyls Snow Hydrogen peroxide.
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[08BA6195286B]
http://linked.open...i/riv/nazevZdroje	Environmental Science & Technology
http://linked.open...in/vavai/riv/obor	CC
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Environmental consequences of photochemical processes in ice and snow
http://linked.open...UplatneniVysledku	2007
http://linked.open...v/svazekPeriodika	41
http://linked.open...iv/tvurceVysledku	Klánová, Jana Klán, Petr Matykiewiczová, Nina
http://linked.open...ain/vavai/riv/wos	000251582800019
http://linked.open...n/vavai/riv/zamer	Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL)
issn	0013-936X
number of pages	7 (xsd:int)
http://localhost/t...ganizacniJednotka	14310

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