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Heavy metal distribution in the four fractions (exchangeable/carbonate, oxidisable, reducible, and residual fractions) after 27 days of incubation of polluted sediments in the presence of the four mixed cultures (see Table 1 for bacterial composition) and in the control microcosm (ctr). Panel (A), arsenic; (B), cadmium; (C), copper; (D), lead; (E), zinc. The asterisk (*) indicates significant difference between treatments and control.
