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Sergey D. Varfolomeev, , Kirill M. Solov’ev, Irina V. Gachok, Svetlana B. Tsybenova
Kinetic model of metal accumulation by plants. Gold
and rare earth elements in natural coals of Russia
Abstract
Abstract. The phenomenon of metal accumulation by plants is
discussed. The metal content in plants can be tens to hundreds of times higher
than the metal content in the soil. A kinetic model of phytomining has been
developed. The model was verified based on experimental data, revealing a
two-chamber nature of the process. A parametric analysis of the model was
conducted, clarifying the role of the metal transfer rate from the geological substrate,
metal translocation within the plant, and describing the dynamics of metal
bioaccumulation. Natural coals are characterized by exceptionally high ash
content – a metal content of up to 50% – and represent a dynamic reflection of
metal accumulation over vast periods of time. Data on the metal content in many
coal deposits across Russia (Moscow region basin, Donetsk basin, and deposits
in Siberia) are presented. The phytomining model is extended to a
macro-historical period (tens to hundreds of millions of years). An increase in
the ash content of metals with the age of the coal deposit formation is
demonstrated.
Key words: kinetic model, gold, rare-earth elements, chemical composition,
natural coal, phytomining
Copyright (C) Chemistry Dept., Moscow State University, 2002
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