Use Of Sequential Extraction Procedures For The Natural Attenuation Of Radionuclides

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Metals at impacted and unimpacted sites are generally found in one of the following fractions: (1) dissolved, (2) occupying exchange sites of inorganic and organic soil constituents, (3) specifically adsorbed on inorganic soil constituents, (4) complexed with insoluble soil organics, (5) precipitated or coprecipitated as solids, or (6) occluded within the structure of primary and/or secondary minerals. Sequential extraction of soils and sediments has been developed to selectively remove and quantify contaminants from various defined geochemical fractions or mineral phases. The objective of these sequential extraction procedures (SEPs) is not to identify the actual form of a given metal in ... continued below

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17 pages

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Lear, Paul R. February 25, 2003.

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Description

Metals at impacted and unimpacted sites are generally found in one of the following fractions: (1) dissolved, (2) occupying exchange sites of inorganic and organic soil constituents, (3) specifically adsorbed on inorganic soil constituents, (4) complexed with insoluble soil organics, (5) precipitated or coprecipitated as solids, or (6) occluded within the structure of primary and/or secondary minerals. Sequential extraction of soils and sediments has been developed to selectively remove and quantify contaminants from various defined geochemical fractions or mineral phases. The objective of these sequential extraction procedures (SEPs) is not to identify the actual form of a given metal in a soil or similar material, but to categorize the metals into defined geochemical fractions: e.g., exchangeable, acid extractable, reducible, organic, oxidizable, or residual. SEPs provide: (1) information on likely metal immobilization mechanism(s), (2) a mass balance of metal immobilization mechanisms, which can be used to gauge long term stability and develop site management criteria, (3) estimates on the fraction of metal in soil or sediment that may have ready impact to human health and the environment (free ion concentration from the exchangeable extraction), (4) estimates on the fraction of metal in soil or sediment that has the potential to be bioaccumulated in less-complex organisms and plants, (5) estimates on the fraction of metal in soil or sediment that has the potential to be bioaccumulated by more complex organisms.

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17 pages

Source

  • Waste Management 2003 Symposium, Tucson, AZ (US), 02/23/2003--02/27/2003

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  • Report No.: NONE
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 825752
  • Archival Resource Key: ark:/67531/metadc780378

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 25, 2003

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • Jan. 22, 2016, 5:40 p.m.

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Lear, Paul R. Use Of Sequential Extraction Procedures For The Natural Attenuation Of Radionuclides, article, February 25, 2003; (digital.library.unt.edu/ark:/67531/metadc780378/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.