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Soil Remediation – Mercury Speciation in Soil and Vapor Phase During Thermal Treatment

Authors
  • Taube, F.1, 2
  • Pommer, L.3
  • Larsson, T.1
  • Shchukarev, A.1
  • Nordin, A.3
  • 1 Umeå University, Department of Chemistry, Environmental and Biogeochemistry, Umeå, 901 87, Sweden , Umeå (Sweden)
  • 2 Sahlgrenska University Hospital, Occupational and Environmental Medicine, Gothenburg, 405 30, Sweden , Gothenburg (Sweden)
  • 3 Umeå University, Energy Technology and Thermal Process Chemistry, Applied Physics and Electronics, Umeå, 901 87, Sweden , Umeå (Sweden)
Type
Published Article
Journal
Water Air & Soil Pollution
Publisher
Springer-Verlag
Publication Date
Apr 18, 2008
Volume
193
Issue
1-4
Pages
155–163
Identifiers
DOI: 10.1007/s11270-008-9679-y
Source
Springer Nature
Keywords
License
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Abstract

Spectroscopic (XRD, XPS, ICP-MS and AAS) and microscopic (ESEM) techniques have been used in order to study the chemical effects with emphasis on mercury speciation, during thermal treatment of a mercury contaminated soil. In the untreated soil, mercury was found concentrated in spherical particles, which were successively broken down upon thermal treatment. Hg0 and inorganic mercury compounds (presumably HgO(s) and HgSO4(s)) could be detected. No (CH3)2Hg and only traces of CH3Hg+ could be found. The dependence on temperature and heating time indicated that the evaporation of mercury from the soil was partly controlled by diffusion mechanisms. Mercury volatilized in two separate stages during heating; initial elemental vaporization, and subsequent volatilization of the oxide or sulfate phase at higher temperatures (>230°C). By thermal treatment at 470°C and 20 min, a removal of >99% of the mercury could be achieved.

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