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An integrated colloid fractionation approach applied to the characterisation of porewater uranium–humic interactions at a depleted uranium contaminated site

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Title: An integrated colloid fractionation approach applied to the characterisation of porewater uranium–humic interactions at a depleted uranium contaminated site
Authors: Graham, Margaret C.1 Margaret.Graham@ed.ac.uk, Oliver, Ian W.2, MacKenzie, Angus B.2, Ellam, Robert M.2, Farmer, John G.1
Source: Science of the Total Environment. Oct2008, Vol. 404 Issue 1, p207-217. 11p.
Subject Terms: *Uranium cycle (Biogeochemistry), *Water chemistry, *Soil testing, *Hazardous waste sites, Colloids -- Environmental aspects, Migration of uranium, Ultrafiltration, Inductively coupled plasma mass spectrometry
Abstract: Abstract: Methods for the fractionation of aquatic colloids require careful application to ensure efficient, accurate and reproducible separations. This paper describes the novel combination of mild colloidal fractionation and characterisation methods, namely centrifugal ultrafiltration, gel electrophoresis and gel filtration along with spectroscopic (UV–visible) and elemental (Inductively Coupled Plasma-Optical Emission Spectroscopy, Inductively Coupled Plasma-Mass Spectrometry) analysis, an approach which produced highly consistent results, providing improved confidence in these methods. Application to the study of the colloidal and dissolved components of soil porewaters from one soil at a depleted uranium (DU)-contaminated site revealed uranium (U) associations with both large (100 kDa–0.2 µm) and small (3–30 kDa) humic colloids. For a nearby soil with lower organic matter content, however, association with large (100 kDa–0.2 µm) iron (Fe)–aluminium (Al) colloids in addition to an association with small (3–30 kDa) humic colloids was observed. The integrated colloid fractionation approach presented herein can now be applied with confidence to investigate U and indeed other trace metal migration in soil and aquatic systems. [Copyright &y& Elsevier]
Copyright of Science of the Total Environment is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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An: 34200351
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  Data: An integrated colloid fractionation approach applied to the characterisation of porewater uranium–humic interactions at a depleted uranium contaminated site
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  Data: <searchLink fieldCode="AR" term="%22Graham%2C+Margaret+C%2E%22">Graham, Margaret C.</searchLink><relatesTo>1</relatesTo><i> Margaret.Graham@ed.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Oliver%2C+Ian+W%2E%22">Oliver, Ian W.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22MacKenzie%2C+Angus+B%2E%22">MacKenzie, Angus B.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Ellam%2C+Robert+M%2E%22">Ellam, Robert M.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Farmer%2C+John+G%2E%22">Farmer, John G.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Science+of+the+Total+Environment%22">Science of the Total Environment</searchLink>. Oct2008, Vol. 404 Issue 1, p207-217. 11p.
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  Data: *<searchLink fieldCode="DE" term="%22Uranium+cycle+%28Biogeochemistry%29%22">Uranium cycle (Biogeochemistry)</searchLink><br />*<searchLink fieldCode="DE" term="%22Water+chemistry%22">Water chemistry</searchLink><br />*<searchLink fieldCode="DE" term="%22Soil+testing%22">Soil testing</searchLink><br />*<searchLink fieldCode="DE" term="%22Hazardous+waste+sites%22">Hazardous waste sites</searchLink><br /><searchLink fieldCode="DE" term="%22Colloids+--+Environmental+aspects%22">Colloids -- Environmental aspects</searchLink><br /><searchLink fieldCode="DE" term="%22Migration+of+uranium%22">Migration of uranium</searchLink><br /><searchLink fieldCode="DE" term="%22Ultrafiltration%22">Ultrafiltration</searchLink><br /><searchLink fieldCode="DE" term="%22Inductively+coupled+plasma+mass+spectrometry%22">Inductively coupled plasma mass spectrometry</searchLink>
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  Data: Abstract: Methods for the fractionation of aquatic colloids require careful application to ensure efficient, accurate and reproducible separations. This paper describes the novel combination of mild colloidal fractionation and characterisation methods, namely centrifugal ultrafiltration, gel electrophoresis and gel filtration along with spectroscopic (UV–visible) and elemental (Inductively Coupled Plasma-Optical Emission Spectroscopy, Inductively Coupled Plasma-Mass Spectrometry) analysis, an approach which produced highly consistent results, providing improved confidence in these methods. Application to the study of the colloidal and dissolved components of soil porewaters from one soil at a depleted uranium (DU)-contaminated site revealed uranium (U) associations with both large (100 kDa–0.2 µm) and small (3–30 kDa) humic colloids. For a nearby soil with lower organic matter content, however, association with large (100 kDa–0.2 µm) iron (Fe)–aluminium (Al) colloids in addition to an association with small (3–30 kDa) humic colloids was observed. The integrated colloid fractionation approach presented herein can now be applied with confidence to investigate U and indeed other trace metal migration in soil and aquatic systems. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Science of the Total Environment is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.scitotenv.2008.05.042
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      – Code: eng
        Text: English
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        PageCount: 11
        StartPage: 207
    Subjects:
      – SubjectFull: Uranium cycle (Biogeochemistry)
        Type: general
      – SubjectFull: Water chemistry
        Type: general
      – SubjectFull: Soil testing
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      – SubjectFull: Hazardous waste sites
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      – SubjectFull: Colloids -- Environmental aspects
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      – SubjectFull: Migration of uranium
        Type: general
      – SubjectFull: Ultrafiltration
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      – SubjectFull: Inductively coupled plasma mass spectrometry
        Type: general
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      – TitleFull: An integrated colloid fractionation approach applied to the characterisation of porewater uranium–humic interactions at a depleted uranium contaminated site
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              M: 10
              Text: Oct2008
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              Y: 2008
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