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Scorodite dissolution kinetics: implications for arsenic release.

Mary C Harvey1, Madeline E Schreiber, J Donald Rimstidt

  • 1Department of Geosciences, 4044 Derring Hall, Virginia Tech, Blacksburg Virginia 24061, USA.

Environmental Science & Technology
|December 6, 2006
PubMed
Summary
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Scorodite dissolution rates vary with pH and temperature, impacting arsenic sequestration. Higher pH and temperature increase scorodite dissolution, crucial for understanding arsenic stability in the environment.

Area of Science:

  • Environmental Science
  • Geochemistry
  • Mineralogy

Background:

  • Scorodite (FeAsO4·2H2O) is a common arsenic-bearing mineral in mine tailings and contaminated soils.
  • Understanding scorodite dissolution is critical for predicting arsenic mobility and environmental risk.

Purpose of the Study:

  • To quantify scorodite dissolution rates under environmentally relevant pH and temperature conditions.
  • To assess the influence of pH and temperature on scorodite stability and arsenic release.

Main Methods:

  • Experimental dissolution of synthetic scorodite across a range of pH (2-10) and temperatures (25-75°C).
  • Arsenic (As) concentration in solution was monitored over time to calculate dissolution rates.
  • Dissolution mechanisms (congruent vs. incongruent) were inferred by comparing rates with scorodite stability diagrams.

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Main Results:

  • Dissolution rates were slowest at pH 3 and increased with deviations towards lower or higher pH.
  • Dissolution was congruent at pH 2 and incongruent at pH ≥ 3, with potential underestimation of rates due to As adsorption on iron hydroxides.
  • Scorodite dissolution rates increased significantly with temperature and pH, by up to half an order of magnitude.

Conclusions:

  • Scorodite dissolution is highly sensitive to pH and temperature, influencing its long-term stability.
  • The findings have implications for managing arsenic contamination and evaluating scorodite as an arsenic sequestration material.
  • Environmental conditions significantly affect the rate of arsenic release from scorodite.