SELECTION OF SPECIES FOR PHYTOREMEDIATION OF ENVIRONMENTS CONTAMINATED BY BARIUM UNDER LOW REDOX POTENTIAL

• DOI: 10.22533/at.ed.9732102225085

• Palavras-chave: Selection, phytoremediation, barium, redox potential.

• Keywords: Selection, phytoremediation, barium, redox potential.

• Abstract:

  The growing and intensive exploration activity of oil and gas has considerably increased the use of Barium Sulfate (BaSO4) and consequently the amount of barium salts (Ba2+) dispersed in the environment. Given this paradigm, the present research aimed to select plant species that have tolerance and ability to phytoremediate flooded environments contaminated by the heavy metal Barium (Ba). 10 Species were pre-selected: two rice varieties (Oryza sativa; IRGA 424 and IRGA Br. Tropical); junco (Eleocharis interstincta); braquiária (Fuirena umbellata); braquiarão (Urochloa brizantha); papiro (Nephrolepsis cf. rivularis), samambaia (Nepholepsis cf. rivulares), junco (Eleocharis acutangula 1), junco (Eleocharis acutangula 2) and cattail (Thypha domingensis). The treatments presented six levels of (BaCl2) and were kept under water depths. The C. cf. papyrus presented the best accumulation rates for leaf analysis, showing a general average of 12.34 mg of accumulated Ba2+. As for the roots, the T. domingensis stood out with the best cumulative rates, reaching an Average of 45.48 mg of Ba2+. In the plant as a whole, the species: T. domingensis was also the one that accumulated the most Ba+2 in its structure, with an average of 56.35 mg of accumulated Ba2+. The species: N. cf. rivulares showed a high degree of sensitivity to (BaCl2) levels, reaching death during the course of the phytoremediation assay. The Species that showed more tolerance and aptitude to extract and accumulate Ba+2 was the T. domingensis. The C. cf. papyrus ranked second, but showed a marked difference in relation to T. domingensis. The other Species reported relatively close values that ranged from 2.83 mg to 12.51 mg of extracted and accumulated Ba+2. The Species: N. cf. rivulares showed high sensitivity to the contaminant, not being indicated for phytoremediation programs of this nature.

• Número de páginas: 16