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Related Experiment Videos

Mercury emissions from cement-stabilized dredged material.

Sandra M Goodrow1, Robert Miskewitz, Richard I Hires

  • 1Department of Environmental Sciences, Rutgers University, 14 College Farm Road, New Brunswick, New Jersey 08901, USA.

Environmental Science & Technology
|November 22, 2005
PubMed
Summary

Upland placement of dredged materials releases mercury to the atmosphere. While local impacts are small, the annual mercury volatilization rate from these sites is comparable to industrial sources in New Jersey.

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Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Geochemistry

Background:

  • Upland placement of dredged materials from navigation channels is a common sediment management strategy.
  • Potential air quality impacts, specifically mercury flux, from these sites are not well understood.
  • This study focuses on stabilized dredged material (SDM) used for land reclamation in New Jersey.

Purpose of the Study:

  • To estimate the flux of total gaseous mercury (TGM) to the atmosphere from SDM.
  • To assess the air quality impacts of upland dredged material placement.
  • To compare mercury volatilization rates from SDM sites to industrial emissions.

Main Methods:

  • Measured TGM concentrations at an SDM placement site and an urban reference site.

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  • Utilized micrometeorological techniques to estimate sediment-air fluxes of mercury.
  • Analyzed TGM data for seasonality and correlation with solar radiation.

    • Main Results:

    • TGM concentrations at the SDM site were significantly higher than at the urban reference site.
    • Sediment-air mercury fluxes were positively correlated with solar radiation (r² = 0.81).
    • Estimated annual TGM volatilization from the SDM site (130 kg y⁻¹) is comparable to New Jersey industrial sources.

    Conclusions:

    • Upland placement of dredged materials can be a source of atmospheric mercury.
    • While local TGM contributions from SDM are negligible (<4%), the overall volatilization rate is significant.
    • Further research is needed to understand the broader implications of mercury release from dredged materials.