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Methylmercury sorption onto engineered materials.

Katherine A Muller1, Craig C Brandt2, Teresa J Mathews1

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Summary
This summary is machine-generated.

Four sorbents were evaluated for methylmercury (MeHg) sorption, with SediMite (SM) proving most cost-effective for in-situ remediation, especially when MeHg is complexed with dissolved organic matter (DOM). Performance varied by concentration and DOM presence.

Keywords:
Dissolved organic matterIsothermMercuryMethylmercurySorbentsSorption

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Area of Science:

  • Environmental Science
  • Environmental Chemistry
  • Remediation Technologies

Background:

  • Methylmercury (MeHg) contamination poses significant environmental and health risks.
  • In-situ remediation requires sorbent materials effective under complex environmental conditions, including the presence of dissolved organic matter (DOM).
  • Understanding MeHg sorption behavior with DOM is crucial for effective mercury remediation strategies.

Purpose of the Study:

  • To evaluate the sorption capacity of four commercially available sorbents (BioChar (BC), ThiolSAMMS® (TS), SediMite (SM), and Organoclay™ PM-199 (OC-199)) for methylmercury (MeHg).
  • To assess the influence of dissolved organic matter (DOM) on MeHg sorption by these materials.
  • To determine the most cost-effective sorbent for in-situ remediation of MeHg-contaminated sites, using East Fork Poplar Creek (EFPC) as a case study.

Main Methods:

  • Sorption isotherms were generated for MeHg and MeHg:DOM complexes using BC, TS, SM, and OC-199.
  • Isotherms were fitted using a robust, iterative re-weighting scheme to accurately determine sorption behavior.
  • A case study of East Fork Poplar Creek (EFPC) was used to correlate aqueous and fish MeHg concentrations and compare sorbent costs.

Main Results:

  • Without DOM, BC, TS, and SM showed similar MeHg sorption, while OC-199 sorbed less. Performance varied with concentration: BC best below 5.6 ng/L, SM between 5.6-20.9 ng/L, and TS above 20.9 ng/L.
  • With DOM, SM was superior at low concentrations (<0.98 ng/L), and TS excelled at higher concentrations, indicating DOM-sorbent interactions controlled MeHg:DOM sorption.
  • DOM reduced MeHg sorption on BC and SM, had minimal effect on TS, and slightly increased it on OC-199. SM was identified as the most cost-effective option for EFPC remediation.

Conclusions:

  • Sorbent performance for MeHg is concentration-dependent and significantly influenced by the presence of DOM.
  • SediMite (SM) offers the most cost-effective solution for in-situ remediation of MeHg contamination at sites like EFPC, particularly under DOM-influenced conditions.
  • The chosen fitting method provides a more accurate representation of sorption behavior compared to traditional approaches.