. "3"^^ . . "41" . "3"^^ . "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." . . "Matykiewiczov\u00E1, Nina" . "Photochemical degradation of PCBs in snow."@en . . . "000251582800019" . . "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 . . "41" . . . "RIV/00216224:14310/07:00020846!RIV10-MSM-14310___" . . "Photochemical degradation of PCBs in snow." . "Photochemical degradation of PCBs in snow."@en . "Kl\u00E1n, Petr" . . . "14310" . . "P(GA205/05/0819), Z(MSM0021622412)" . . "441235" . "Kl\u00E1nov\u00E1, Jana" . "0013-936X" . . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . . . . . "Environmental Science & Technology" . "Photochemistry; Irradiation; Snow; Ice; Persistent organic pollutants; Polychlorinated biphenyls; Hydrogen peroxide."@en . . "7"^^ . . "Photochemical degradation of PCBs in snow." . "RIV/00216224:14310/07:00020846" . . . "[08BA6195286B]" .