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Title
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Solving mercury (Hg) speciation in soil samples by synchrotron X-ray microspectroscopic techniques
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Author
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Abstract
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| Direct mercury (Hg) speciation was assessed for soil samples with a Hg concentration ranging from 7 up to 240 mg kg1. Hg chemical forms were identified and quantified by sequential extractions and bulkand micro-analytical techniques exploiting synchrotron generated X-rays. In particular, microspectroscopic techniques such as m-XRF, m-XRD and m-XANES were necessary to solve bulk Hg speciation, in both soil fractions <2 mm and <2 mm. The main Hg-species found in the soil samples were metacinnabar (b-HgS), cinnabar (a-HgS), corderoite (Hg3S2Cl2), and an amorphous phase containing Hg bound to chlorine and sulfur. The amount of metacinnabar and amorphous phases increased in the fraction <2 mm. No interaction among Hg-species and soil components was observed. All the observed Hgspecies originated from the slow weathering of an inert Hg-containing waste material (K106, U.S. EPA) dumped in the area several years ago, which is changing into a relatively more dangerous source of pollution. |
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Language
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English
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Source (journal)
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Environmental pollution. - London, 1987, currens
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Publication
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London
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2010
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ISSN
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0269-7491
[print]
1873-6424
[online]
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Volume/pages
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158
:8
(2010)
, p. 2702-2709
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ISI
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000280571500026
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Full text (Publisher's DOI)
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