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Доповіді НАН України. – 2008. – N 5. – С. 174–180.
Экспериментальное обоснование термодинамического прогнозирования редокс-взаимодействия микроорганизмов с металлами-окислителями (Hg2+, CrO42– и Cu2+)
А.Б. Таширев, Н.А. Матвеева, А.А. Таширева, В.А. Романовская
Abstract
The growth of chemoorganotrophic microorganisms at ultrahigh concentrations
of toxic metals-oxidizers (Hg2+, CrO42–, and Cu2+) is
possible owing to a manifold increase in the concentration of metals
(from 1 · 10–8 up to 1.0 mole/l) causes increasing their standard
redox-potential (Eo) only by 200...400 mV, which stays in
a zone of thermodynamic stability of water (–414 mV ≤ Eh ≤ +814 mV).
Microorganisms of the granulated biocatalyst and Antarctic soil
microorganisms are capable to grow in the presence of 500...1000 ppm Hg
(ІІ), 5000...60000 ppm Cr (VI), and 1000...10000 ppm Cu (II).
High values of redox-potentials of Hg2+, CrO42–, and Cu2+
(+920 mV, +555 mV and +440 mV) predetermine the reduction of these metals by
alive microorganisms. Microbial reduction of Hg2+, CrO42–, and
Cu2+ leads to the formation of insoluble forms of metals and their
sedimentation in solutions. Technogenic associations and the Antarctic soil
microorganisms resistant to ultrahigh concentrations of these metals can be
used for the development of new environment-protective technologies providing the
purification of industrial waste waters from metals in any certain concentration
or a wide range of concentrations.
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