DOI: 10.5593/SGEM2015/B32/S13.032


L.A. Muscalu, D. R. Popoviciu, T. Negreanu-Pirjol, R. Bercu, M. Fagaras
Thursday 24 September 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-37-7 / ISSN 1314-2704, June 18-24, 2015, Book3 Vol. 2, 237-242 pp

The purpose of this paper was to assess the natural potential for phytoaccumulation in three exotic ornamental Euphorbia species: E. pulcherrima, E. tirucalli and E. trigona, for Cu, Zn and Mn.
Vegetative aboveground organs samples, as well as soil samples were taken for each species and analyzed using the atomic absorption spectrometry technique to determine metal concentration. In order to evaluate each species’ phytoaccumulation potential, the Biological Accumulation Coefficients (BAC) were calculated.
According to obtained data, that, none of the three species can be considered a hyperaccumulator, when comparing metal concentration in plant tissues with widely-accepted minimal thresholds for Cu, Zn and Mn hyperaccumulators. The highest average values obtained were 8.16 ppm, for Cu (E. tirucalli), 60.5 ppm, for Mn (E. tirucalli) and 78.8 ppm, for Zn (E. trigona).
All average BAC values calculated for the three species were below 1. Values closest to 1 (with even higher than 1, for individual plants) were found in E. tirucalli (0.88 average BAC for Cu). E. tirucalli also showed relatively high BAC for Zn. The two other species had average BAC for Zn around 0.5 (0.55, for E. pulcherrima and 0.48, for E. trigona).
In conclusion, none of the species analyzed can be considered as a Cu, Zn or Mn hyperaccumulator, at least on natural, unpolluted soil. Of all the three species, however, E. tirucalli shows interesting traits, being suitable for further research.

Keywords: phytoaccumulation, Euphorbia, copper, zinc, manganese

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