Evaluación de los efectos ecotoxicológicos del cromo hexavalente, mediante bioensayos en Zantedeschia aethiopica y Helianthus annuus.

Abstract

This research is intended to examine the eco-toxicological efffects of Chromium VI by developing bioassays with the vegetable species Zantedeschia aethiopica and Helianthus annuus for taking on board the environmental problems arising from the presence of ChromiumVI contained in the industrial wastes; Throughout the study the adverse effect of chromium VI on the plant germination and growth were examined, quantified and qualified, from a bioassay solution of Dichromate of potassium with concentration of 0,50,100,200 and 300 ppm chromium; samle size at the germination stage was 30 experimental units of every specie and at the growing stage was 15 units; acute toxicity bioassay on seeds were carried out for 184 hours, the research desing was absolutely randomized (DCA) in regarding the relative elongation of radicle (ER%), as well as the relative germination percentage (GR%) and the germination index (GI%) an thus, the plant growing was evaluated through the analysis (ACP) of principal components on the basis of the foliage width, the plant height and, the bioaccumulation accounts for 63,6 ppm in the case of Z. aethiopica and, a greater phytoextraction potential in the case of specie H. annuus. Therefore, it advisable to perform bioassays into countryside small parcels so that it enables to study the plant dynamic not only from pot plant but also from plants produced in real environmental condition for testing if the interaction of other factors could modify the response of these species.