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Related Experiment Videos

Bioaccessibility testing of cobalt compounds.

Woodhall Stopford1, John Turner, Danielle Cappellini

  • 1Duke University Medical Center, Department of Community & Family Medicine, Division of Occupational & Environmental Medicine, Box 3834, Durham, NC 27710, USA.

Journal of Environmental Monitoring : JEM
|September 2, 2003
PubMed
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This study measured cobalt compound bioaccessibility in artificial human fluids. Cobalt salts showed high solubility, while alloys and spinels had minimal dissolution, impacting human health risk assessments.

Area of Science:

  • Environmental Science
  • Toxicology
  • Materials Science

Background:

  • Metal compound solubility testing in artificial fluids estimates human health risks.
  • Bioaccessibility, measured in vitro, serves as a surrogate for metal bioavailability.
  • Understanding cobalt compound behavior in simulated body fluids is crucial for exposure assessment.

Purpose of the Study:

  • To measure and compare the bioaccessibility of selected cobalt compounds in artificial human tissue fluids and human serum.
  • To initiate validation of an in vitro methodology for estimating cobalt bioavailability.
  • To assess the impact of compound species and fluid properties on cobalt solubility.

Main Methods:

  • Evaluated bioaccessibility of cobalt(II) from 11 cobalt compounds and an alloy in 5 surrogate fluids and human serum.

Related Experiment Videos

  • Utilized extraction times up to 72 hours.
  • Assessed effects of pH, dissolution time, and mass-ion effect on cobalt bioaccessibility.

    • Main Results:

    • Cobalt compound species significantly impacted solubility.
    • Physico-chemical properties of surrogate fluids, particularly pH, greatly influenced cobalt solubility.
    • Cobalt salts (e.g., cobalt(II) sulfate heptahydrate) exhibited high solubility.
    • Cobalt alloys and cobalt aluminate spinels demonstrated minimal dissolution.

    Conclusions:

    • In vitro bioaccessibility is a valuable surrogate for metal bioavailability in risk assessment.
    • Cobalt compound solubility is highly dependent on its chemical form and the properties of the surrounding medium.
    • The findings provide data for a conservative estimate of cobalt bioavailability from various exposure sources.