Mercury speciation in soil in vicinity of coal beds using sequential extraction |
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Authors: | Pavel Coufalík Rostislav ?ervenka Josef Komárek |
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Institution: | 1.Department of Chemistry, Faculty of Science,Masaryk University,Brno,Czech Republic |
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Abstract: | The sequential extraction procedure was proposed and used to study of mercury speciation in real samples of soil. Samples
of soil profiles together with bedrock and coal were taken from sampling spots in the vicinity of surficial coal beds in an
area with natural coal outcrops. The proposed sequential extraction procedure involves the following fractionation: organic
mercury compounds, extractable mercury in an acidic medium, mercury bound to humic substances, elemental Hg and mercury bound
to complexes, HgS and residual mercury. The significant distribution of mercury between the two portions—mercury bound to
humic substance and HgS was determined in the majority of samples. The mercury bound to humic substances created a significant
contribution, especially to the top layer of soil. On the other hand, HgS was the dominant form in the samples from lower
layers of the soil profile. The mercury content in the samples did not show a distinct mobility. The influence of soil parameters
on the mercury distribution in the studied samples was investigated and discussed. |
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