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If Hg reduction by HzOz were the main process for this dissolved gaseous mercury production, we wouldexpectblack and transparentbottles spiked with HzOzto show significant increases in DGM levels after incubation when compared to unspiked treatments

Sunlight-induced formation of dissolved gaseous mercury in lake waters.

Environmental science & technology, no. 13 (1994): 2366-2371

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摘要

Formation of dissolved gaseous mercury (DGM) was measured in lake water incubated at midday in Teflon bottles. DGM production was photoinduced as transparent bottles yielded DGM concentrations that were 2.4-9 times higher than dark controls. These results provide the first experimental evidence obtained in the field of a direct link betwe...更多

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简介
  • Despite the fact that anthropogenic emissions of Hg from chloralkaliplants have been drastically reduced since the 1960s and early 1970s [1,2,3],Hg is still spreading in the environment.
  • Hg deposition is controlled by the oxidation of HgO to Hg(I1) in the air followed by dissolution in atmospheric water or adsorption to particulates.
  • Due to its lowsolubility and favorable Henry's law constant, HgO is the principal form contributing to volatilization and dissolved gaseous mercury (DGM) concentration [7,8].
  • Abiotic reduction in water of Hg(I1) into HgO can be initiated by humic substances [10].
重点内容
  • Despite the fact that anthropogenic emissions of Hg from chloralkaliplants have been drastically reduced since the 1960s and early 1970s [1,2,3],Hg is still spreading in the environment
  • Due to its lowsolubility and favorable Henry's law constant, HgO is the principal form contributing to volatilization and dissolved gaseous mercury (DGM) concentration [7,8]
  • Technol., Vol 28, No 13, 1994 from 182 fMh-1 in August to 77 fMh-l in September and 17 fM h-' in November. These results indicate that sunlight induces DGM production in unfiltered lake water
  • When compared to dark DGM production, photoinduced DGM production is quantitatively the only process of significance under midday conditions. These results provide the first experimental evidence obtained under field conditions of a direct link between solar radiation and in situ DGM production
  • If Hg reduction by HzOz were the main process for this DGM production, we wouldexpectblack and transparentbottles spiked with HzOzto show significant increases in DGM levels after incubation when compared to unspiked treatments
结果
  • Values were similar with Teflon bottles absorbing less than 2.5%. Perature, explained a smaller portion of the observed variation in DGM,, yielding adjusted R2of 0.79 (N = 6; p = 0.011) and 0.76 (N = 6;p = 0.015),respectively.
  • On November 14 (Ranger Lake), spikedsamplesin transparent bottles yielded DGM levels 33% lower than those unspiked.
  • Sunlight had a direct and quantitatively importanteffect on DGM production in surface waters from lakes.
  • This effect was mainly driven by biological or photochemical processes induced by visible and UVA light, with UVB lightresponsible for less than 25% of the DGM production
结论
  • Sunlight had a direct and quantitatively importanteffect on DGM production in surface waters from lakes.
  • This effect was mainly driven by biological or photochemical processes induced by visible and UVA light, with UVB lightresponsible for less than 25% of the DGM production.
  • The authors hypothesize that the primary process for DGM production in lakes is the biological or photochemical reduction of Hg in the epilimnion by visible light or UVA light.
  • A possible mechanism would be the cell surface enzymaticreduction of Hg by algae [22]
表格
  • Table1: Abbreviations
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基金
  • This research was supported by Environment Canada's Green Pian Program for evaluating aquatic impacts of UVBlight, an NSERC Operating Grant to D.R.S.L. and D.J.M., and an NSERC postgraduate scholarship to M.A
研究对象与分析
data: 6
The asterisk indicates the presence 01 only one replicate. perature, explained a smaller portion of the observed variation in DGM,, yielding adjusted R2of 0.79 (N = 6; p = 0.011) and 0.76 (N = 6;p = 0.015),respectively. Effect of Hydrogen Peroxide on DGM Production

引用论文
  • Sci. 1989, 46, 2184-2202.
    Google ScholarFindings
  • Martinelli, L. A.; Ferreira, J. R.; Forsberg, B. R.; Victor, R. L. Ambio 1988, 17 (4), 252-254.
    Google ScholarLocate open access versionFindings
  • Nriagu, J. 0. Science 1989, 338, 4749.
    Google ScholarLocate open access versionFindings
  • Meili, M. Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science, Acta Universitatis Upsaliensis. 1991, Vol. 336, 36 pp.
    Google ScholarFindings
  • Winfrey, M. R.; Rudd, J. W. M. Environ. Toxicol. Chem. 1990, 9, 853-869.
    Google ScholarLocate open access versionFindings
  • Hakanson, L.; Nilsson, A.; Andersson, T. Enuiron. Pollut. 1988,49, 145-162.
    Google ScholarLocate open access versionFindings
  • Vandal, G. M.; Mason, R. P.; Fitzgerald, F. Water Air Soil Pollut. 1991, 56, 791-803.
    Google ScholarFindings
  • Kim, P. J.; Fitzgerald, W. F. Science 1986, 231, 1131.
    Google ScholarLocate open access versionFindings
  • Xiao, 2. F.; Munthe, J.; Schroeder, W. H.; Lindqvist, 0. Tellus 1991,43B (3), 267-279.
    Google ScholarFindings
  • Alberts, J. J.; Schindler,J. E.; Miller, R. W. Science 1974, 184,895-897.
    Google ScholarLocate open access versionFindings
  • Turner, R. R.; VandenBrook, A. J.; Barkay,T.;Elwood, J. W. Proceedingsof the International Conferenceon Heavy Metals in the Environment, Geneva; CEP Consultants Ltd.: Edinburgh, 1989; p 353.
    Google ScholarLocate open access versionFindings
  • Allard, B.; Arsenie,I. Water Air Soil Pollut. 1991,56,457-464.
    Google ScholarFindings
  • Schroeder, W. H.; Yarwood, G.; Niki, H. Water Air Soil Pollut. 1991, 56, 653-666. Cooper,W.J.;Shao,C.; Lean,D.R. S.;Gordon,A. S.;Scully, F. E. In Environmental Chemistryof Lakes and Reservoirs; Baker, L. A., Ed.; Advances in Chemistry Series; American Chemical Society: Washington, DC, 1994; pp 391-422. Steffan,R. J.;Korthals,E. L.;Winfrey,M. R.App1.Environ. Microbiol. 1988, 54, 2003-2009. Cooper,W.J.;Lean,D.R. S.Encyclopediaof Earth Science; Academic Press: New York, 1994 (in press).
    Google ScholarLocate open access versionFindings
  • Vandal, G. M.; Fitzgerald, W. F.; Lamborg, C. H.; Rolfhus, K. R. In Proceedings of the International Conference on Heavy Metals in the Environment, Toronto; CEP Consultants Ltd.: Edinburgh, 1993; Vol2, pp 297-299. Gill,G.; Bruland,K. Environ. Sci. Technol. 1990,24,1392-
    Google ScholarLocate open access versionFindings
  • 1400. Schroeder,W.;Lindqvist,0.;Munthe,J.; Xiao,2.Sci. Total Environ. 1992, 125, 47-66. Brosset, C. Water Air Soil Pollut. 1987, 34, 145-166.
    Google ScholarFindings
  • Lean, D. R. S.; Cooper, W. J.; Pick, F. R. In Aquatic and Surface Photochemistry; Zepp, R. G., Crosby D. G., Eds.; Lewis Publishers: Ann Arbor, MI, 1993; pp 207-214. Mason,R. P.;Morel,F.M.M.;Hemond,H.F.InProceedings of the International Conference on Heavy Metals in the Environment, Toronto;CEPConsultantsLtd.: Edinburgh, 1993; Vol. 2, pp 293-296.
    Google ScholarLocate open access versionFindings
  • Lovley, D. R. Annu. Rev. Microbiol. 1993, 47, 263-290.
    Google ScholarFindings
  • Barkay, T.; Turner, R. R.; VandenBrook, A.; Liebert, C. Microb. Ecol. 1991,21, 151-161.
    Google ScholarLocate open access versionFindings
  • Hurley, J. P.; Watras, C. J.; Bloom, N. S. Water Air Soil Pollut. 1991, 56, 543-551.
    Google ScholarFindings
  • Fitzgerald, W. F. In Proceedings of the International ConferenceonHeavyMetals in the Environment, Toronto; CEP Consultants Ltd.: Edinburgh, 1993; Vol. 1, pp 320-
    Google ScholarLocate open access versionFindings
  • 323. Lindqvist, 0.;Johansson, K.; Aastrup, M.; Andersson, A.; Bringmark, L.; Hovenius, G.; Hakanson, L.; Iverfeldt, A.; Meili,M.; Timm,B. Water Air Soil Pollut. 1991,55,1-261. Meili, M. Water Air Soil Pollut. 1991, 56, 333-348.
    Google ScholarLocate open access versionFindings
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