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

Journal article
Authors Fabian Taube
Published in Water Air & Soil Pollution
Volume 193
Issue 1-4
Pages 155–163
ISSN 1573-293
Publication year 2008
Published at Institute of Medicine, School of Public Health and Community Medicine
Pages 155–163
Language en
Keywords Mercury speciation, Soil remediation, Elemental mercury, Inorganic mercury, Methylated mercury, Thermal treatment, Chlor-alkali, XRD, XPS, GC-ICP-MS, ESEM
Subject categories Coordination chemistry, Heavy metals and other metals, Soil chemistry


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. Keywords Mercury speciation . Soil remediation . Elemental mercury . Inorganic mercury . Methylated mercury . Thermal treatment . Chlor-alkali . XRD . XPS . GC-ICP-MS . ESEM

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