Mobilita vybraných stopových prvků vázaných v  hnědém uhlí mostecké pánve

Marcela Cahová; Eva Geršlová; Jan Kuta

doi:10.5817/GVMS2019-1-2-98

Mobility of selected trace elements bound in brown coal of the Most basin

Vol.26,No.1-2(2019)

Marcela Cahová Eva Geršlová Jan Kuta

https://doi.org/10.5817/GVMS2019-1-2-98

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Abstract

Some of the trace elements bound in coal are potentially easily mobilizable and can represent a risk for an ecosystem. The aim of the study was to evaluate the extractability of selected metals from brown coal samples under surface conditions. Totally, 10 coal samples from the Main seam of Most Basin were studied using a sequential extraction procedure. Extraction conditions were set to represent real conditions on a dump. Extraction with deionized water was used for the most weakly bound and thus easily mobilizable elements, the amount of weakly adsorbed ions on the surface of the solid matrix was extracted with 1M ammonium acetate solution at pH = 7. For the carbonate-bound fraction, respectively the fraction extractable under mildly acidic conditions, the same reagent at pH = 5 was used. Highest extractable contents in case of arsenic were found in deionized water for samples 03–07, other samples exhibited the highest recovery with weakly acidic reagent (pH = 5) with concentration 1 mol/l. Nickel concentrations in the extracts were mostly low (hundredths to tenths μg/g). Exceptions are water extractable contents (single units of μg/g) in samples 01, 08 and 09. A positive correlation (r = 0.69) was found between the total content of As and Ni, however, the contents of As and Ni do not mutually correlate in each type of extract. Significant contents of vanadium (up to 0.844 μg/g) and chromium (up to 0.28 μg/g) were already extracted using deionized water. Very close behavior of chromium and vanadium was confi rmed by positive correlation in mobile water extractable (r = 0.95) and carbonate fraction (r = 0.85).

Keywords:
Most basin; Sequential Extraction Procedure; trace elements; brown coal

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