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Related Experiment Videos

Predicting arsenic solubility in contaminated soils using isotopic dilution techniques.

A M Tye1, S D Young, N M J Crout

  • 1School of Life and Environmental Sciences, University of Nottingham, University Park, UK.

Environmental Science & Technology
|April 2, 2002
PubMed
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A new isotopic dilution assay measures radiolabile arsenic (As) in soils. Arsenic lability varies with soil pH and contamination source, with lower mobility in historically contaminated sites.

Area of Science:

  • Environmental Chemistry
  • Soil Science
  • Geochemistry

Background:

  • Arsenic (As) contamination in soils poses environmental risks.
  • Understanding arsenic lability is crucial for assessing its bioavailability and mobility.
  • Existing methods may not fully capture the dynamic nature of arsenic in diverse soil environments.

Purpose of the Study:

  • To develop and validate an isotopic dilution assay for measuring radiolabile arsenic in various soil types.
  • To investigate the factors influencing arsenic lability, including pH, soil organic carbon, and historical contamination.
  • To compare arsenic lability in controlled microcosm experiments with real-world contaminated soils.

Main Methods:

  • Development of an isotopic dilution assay for radiolabile arsenic measurement.

Related Experiment Videos

  • Incubation of As-amended soils in aerated microcosms for over 800 days.
  • Application of the assay to soils historically contaminated with sewage sludge and mine spoil.
  • Speciation of soil pore water using the "GEOCHEM" program.

    • Main Results:

    • Radiolabile arsenic ranged from 27-57% of applied As in microcosm soils after 818 days, increasing with pH above 6.
    • Lability in sludge-amended soils (3-60% radiolabile As) was lower than in microcosms, suggesting occlusion in calcium phosphate compounds.
    • In mining soils, radiolabile As ranged from 0.44-19%, with lowest lability associated with high concentrations from arsenopyrite.

    Conclusions:

    • The developed isotopic dilution assay effectively measures radiolabile arsenic across diverse soil conditions.
    • Arsenic lability is significantly influenced by soil pH and the nature of historical contamination.
    • A model based on competition for adsorption sites explains solid-solution arsenic equilibria.