Sensitized photolysis of polychlorobiphenyls in alkaline 2-propanol: dechlorination of Aroclor 1254 in soil samples by solar radiation

Article Abstract:

Research was done at the Biotechnology Research Institute of the National Research Council of Canada on photolysis of polychlorinated biphenyls (PCBs). PCBs are inherently stable both thermally and chemically, as well as being resistant to solar photodegradation and microbial biodegradation. The study examined nonsensitized and phenothiazine-sensitized photolysis of Aroclor 1254 in 2-propanol by irradiation with sunlight and artificial light. The sensitized photolysis showed much promise for field application.

Innovations, Soil disinfection, Photochemistry

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Phototransformation of polychlorobiphenyls in Brij58 micellar solutions

Article Abstract:

Photoreduction through photochlorination was the reaction observed in the degradation of a polychlorinated biphenyl (PCB) congener mixture in Brij 58 micellar solution. The quantum yield for decay of 0.1 micromolar 2,3,4,5-Tetrachlorobiphenyl in 0.5 millimolar of Brij 58 micellar solutions was over six times greater than water and yielded both Cl- and H+ consistent with the original starting materials. The ability of Brij 58 surfactant to degrade PCB is limited only by the surfactant loss to the soil.

Waste Management and Remediation Services, Toxic Substances Control, Environmental aspects, Poisons, Pollution control, Photochemical research, Surface active agents

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Ecotoxicological assessment and effects of physicochemical factors on biofilm development in groundwater conditions

Article Abstract:

The successful stimulation of the native microbial population in a groundwater system to effect a biofilm barrier, was found to be effective in offering some protection to the groundwater system against pentachlorophenate. The metabolic activity of the microorganisms forming the biofilm however were found to be ecotoxic, as seen on its effects on test organisms, such as the limiting the growth of Selenastrum capricornutum and reducing the bioluminescence of Vibrio fischeri.

Administration of Air and Water Resource and Solid Waste Management Programs, Groundwater & Lakes Pollution, Usage, Pollution, Bioremediation, Water pollution control, Microorganisms, Water, Underground, Groundwater

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