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Statements

Subject Item
n2:RIV%2F00216224%3A14310%2F07%3A00020846%21RIV10-MSM-14310___
rdf:type
skos:Concept n18:Vysledek
dcterms: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.
dcterms:title
Photochemical degradation of PCBs in snow. Photochemical degradation of PCBs in snow.
skos:prefLabel
Photochemical degradation of PCBs in snow. Photochemical degradation of PCBs in snow.
skos:notation
RIV/00216224:14310/07:00020846!RIV10-MSM-14310___
n3:aktivita
n7:P n7:Z
n3:aktivity
P(GA205/05/0819), Z(MSM0021622412)
n3:cisloPeriodika
41
n3:dodaniDat
n5:2010
n3:domaciTvurceVysledku
n13:1626418 n13:9665412 n13:3635872
n3:druhVysledku
n19:J
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n12:predkladatel
n3:idSjednocenehoVysledku
441235
n3:idVysledku
RIV/00216224:14310/07:00020846
n3:jazykVysledku
n17:eng
n3:klicovaSlova
Photochemistry; Irradiation; Snow; Ice; Persistent organic pollutants; Polychlorinated biphenyls; Hydrogen peroxide.
n3:klicoveSlovo
n4:Polychlorinated%20biphenyls n4:Hydrogen%20peroxide. n4:Irradiation n4:Snow n4:Photochemistry n4:Persistent%20organic%20pollutants n4:Ice
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[08BA6195286B]
n3:nazevZdroje
Environmental Science & Technology
n3:obor
n10:CC
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:projekt
n9:GA205%2F05%2F0819
n3:rokUplatneniVysledku
n5:2007
n3:svazekPeriodika
41
n3:tvurceVysledku
Matykiewiczová, Nina Klán, Petr Klánová, Jana
n3:wos
000251582800019
n3:zamer
n16:MSM0021622412
s:issn
0013-936X
s:numberOfPages
7
n14:organizacniJednotka
14310