Soil Remediation – Mercury Speciation in Soil and Vapor Phase During Thermal Treatment
| Autor: | Linda Pommer, Fabian Taube, Andrey Shchukarev, Tom Larsson, Anders Nordin |
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| Rok vydání: | 2008 |
| Předmět: |
MERCURE
Environmental Engineering Volatilisation Ecological Modeling chemistry.chemical_element Thermal treatment Pollution Soil contamination Mercury (element) law.invention chemistry.chemical_compound chemistry law Environmental chemistry Vaporization Environmental Chemistry Sulfate Atomic absorption spectroscopy Water Science and Technology |
| Zdroj: | Water, Air, and Soil Pollution. 193:155-163 |
| ISSN: | 1573-2932 0049-6979 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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