Evidence of sensitized photolysis of polychlorinated dibenzo-p-dioxins in natural waters under sunlight conditions

Friesen, K J; Webster, G R.B.; Muir, D C.G.

doi:10.1021/es00081a018

Title: Evidence of sensitized photolysis of polychlorinated dibenzo-p-dioxins in natural waters under sunlight conditions

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Abstract

The sunlight photolysis of carbon-14 labeled 1,2,3,4,7-pentachlorodibenzo-p-dioxin (P{sub 5}CDD) and 1,2,3,4,6,7,8-heptachlorodibenzo-p-dioxin (H{sub 7}CDD) was studied at 50{degree} N latitude in filter-sterilized natural water and in distilled water-acetonitrile (2:3, v/v) solutions to determine the extent of direct versus indirect photolysis under environmental conditions. Under midsummer sunlight conditions, pseudo-first-order sunlight photolysis rate constants (k{sub p}) of 0.74 and 0.28 day{sup {minus}1} were measured for P{sub 5}CDD and H{sub 7}CDD, respectively, in natural water. However, considerably slower direct aqueous photolysis rates were observed for the two PCDD congeners in distilled water-acetonitrile, with rate constants of 0.058 and 0.019 day{sup {minus}1} for P{sub 5}CDD and H{sub 7}CDD, respectively, in relatively good agreement with predicted rates of direct aqueous photolysis. The results indicate that an indirect or sensitized photolytic mechanism may dominate the photodegradation of PCDDs in natural waters. The major degradation product(s) appeared as nonextractable {sup 14}C activity, with increases in this fraction paralleling the disappearance of the parent PCDD.

Authors:

Friesen, K J; Webster, G R.B. ^[1]; Muir, D C.G. ^[2]

Univ. of Manitoba, Winnipeg (Canada)
Freshwater Institute, Winnipeg, Manitoba (Canada)

Publication Date:: Thu Nov 01 00:00:00 EST 1990

OSTI Identifier:: 6039870

Resource Type:: Journal Article

Journal Name:: Environmental Science and Technology; (USA)

Additional Journal Information:: Journal Volume: 24:11; Journal ID: ISSN 0013-936X

Country of Publication:: United States

Language:: English

Subject:: 54 ENVIRONMENTAL SCIENCES; DIOXIN; PHOTOLYSIS; CARBON 14 EMISSION DECAY; DECOMPOSITION; ORGANIC CHLORINE COMPOUNDS; RADIOCHEMICAL ANALYSIS; SURFACE WATERS; CHEMICAL ANALYSIS; CHEMICAL REACTIONS; DECAY; HEAVY ION EMISSION DECAY; HETEROCYCLIC COMPOUNDS; NUCLEAR DECAY; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; PHOTOCHEMICAL REACTIONS; QUANTITATIVE CHEMICAL ANALYSIS; 540310* - Environment, Aquatic- Basic Studies- (1990-)

Citation Formats


                    Friesen, K J, Webster, G R.B., and Muir, D C.G. Evidence of sensitized photolysis of polychlorinated dibenzo-p-dioxins in natural waters under sunlight conditions.  United States: N. p., 1990. 
        Web.  doi:10.1021/es00081a018.

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                    Friesen, K J, Webster, G R.B., & Muir, D C.G. Evidence of sensitized photolysis of polychlorinated dibenzo-p-dioxins in natural waters under sunlight conditions.  United States.  https://doi.org/10.1021/es00081a018

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                    Friesen, K J, Webster, G R.B., and Muir, D C.G. 1990.  
        "Evidence of sensitized photolysis of polychlorinated dibenzo-p-dioxins in natural waters under sunlight conditions".  United States.  https://doi.org/10.1021/es00081a018.

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@article{osti_6039870,

  title        = {Evidence of sensitized photolysis of polychlorinated dibenzo-p-dioxins in natural waters under sunlight conditions},

  author       = {Friesen, K J and Webster, G R.B. and Muir, D C.G.},

  abstractNote = {The sunlight photolysis of carbon-14 labeled 1,2,3,4,7-pentachlorodibenzo-p-dioxin (P{sub 5}CDD) and 1,2,3,4,6,7,8-heptachlorodibenzo-p-dioxin (H{sub 7}CDD) was studied at 50{degree} N latitude in filter-sterilized natural water and in distilled water-acetonitrile (2:3, v/v) solutions to determine the extent of direct versus indirect photolysis under environmental conditions. Under midsummer sunlight conditions, pseudo-first-order sunlight photolysis rate constants (k{sub p}) of 0.74 and 0.28 day{sup {minus}1} were measured for P{sub 5}CDD and H{sub 7}CDD, respectively, in natural water. However, considerably slower direct aqueous photolysis rates were observed for the two PCDD congeners in distilled water-acetonitrile, with rate constants of 0.058 and 0.019 day{sup {minus}1} for P{sub 5}CDD and H{sub 7}CDD, respectively, in relatively good agreement with predicted rates of direct aqueous photolysis. The results indicate that an indirect or sensitized photolytic mechanism may dominate the photodegradation of PCDDs in natural waters. The major degradation product(s) appeared as nonextractable {sup 14}C activity, with increases in this fraction paralleling the disappearance of the parent PCDD.},

  doi          = {10.1021/es00081a018},

  url          = {https://www.osti.gov/biblio/6039870},
  journal      = {Environmental Science and Technology; (USA)},

  issn         = {0013-936X},

  number       = ,

  volume       = 24:11,

  place        = {United States},

  year         = {Thu Nov 01 00:00:00 EST 1990},

  month        = {Thu Nov 01 00:00:00 EST 1990}

}

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