BIOACCUMULATION AND TOXICITY EVALUATION OF CADMIUM AND MERCURY IN LLANERO GRASS (Brachiaria dictyoneura)
Keywords:heavy metals, transfer, phytotoxicity, phytoreductión, phytoremediation.
The transfer of mercury and cadmium in Brachiaria dictyoneura was studied in terms of bioaccumulative
capacity and as a bioindicator. During the evaluation cadmium in B. dictyoneura show a decrease of 65%.
The toxicity of cadmium was correlated with the consecutive accumulation of the cation during the
monitoring time. With respect to mercury, a decrease in cation content in the plant was observed 30
days after exposure, presenting possible phytoreductión of mercury ion Hg2+ to Hg° in B. dictyoneura
and subsequent evaporation. The tolerance and accumulator capacity of B. dictyoneura could be used for
phytoremediation of sites co-contaminated with Cd and Hg.
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