Análise do potencial fitoextrator de macrófitas aquáticas em solução de óxido de arsênio III (AS2O3)
In view of the need for further studies aimed at the decontamination of underground springs, this work aimed to test the potential of three species of aquatic macrophytes in the removal of arsenic III in water. The first experiment was set up using three species of aquatic macrophytes, Pontederia pa...
| Autor principal: | Ferreira, Tatiane Cristovam |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/6988 |
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| Resumo: |
In view of the need for further studies aimed at the decontamination of underground springs, this work aimed to test the potential of three species of aquatic macrophytes in the removal of arsenic III in water. The first experiment was set up using three species of aquatic macrophytes, Pontederia parviflora Alexander, Salvinia Auriculata Aublet. And Cyperus sp. All samples of selected species were performed in triplicates and with control, the contact period with arsenic (As) was 10 days. Pontederia Parviflora that presented better performance was studied anatomically to verify changes influenced by the contaminant. The phytoextraction experiment was set up in a laboratory in an airy place with adequate luminosity. The arsenic solution (As) was prepared in the concentration of 14 ppm and placed in 1.5 liters of this solution about 125 individuals of Pontederia parviflora distributed in 40 containers of Polyethylene. In the first 12 hours approximately 16 subjects were randomly withdrawn, and so on until 96 hours were completed. For the survival test, Salvinia auriculata showed signs of senescence that were progressive and culminated with his death on the sixth day. Pontederia parviflora did not present significant alterations during the experiment, and in the first seven days there were no morphological changes or appearance of shoots. From the eighth day the shoots appeared and varied in quantity and capacity of growth, according to the concentration of arsenic. Cyperus sp. Showed no visible signs of changes during the first seven days of the experiment, however at the end of this period the individuals dried and died, apparently within 24 hours. Pontederia Parviflora even at the highest concentrations of arsenic (As) did not present morphoanatomic changes in its leaves that evoked levels of stress responses in the presence of the contaminant. In the experiment of phytoextraction at the concentration of 14 ppm, Pontederia parviflora, as well as in the first experiment, showed no signs of intolerance to arsenic, however its accumulation rates were low, varying from 0.0009μg / g to 0.029μg / g in the root, and 0.035 μg / g 0.037 μg / g in the leaf and 0.163 μg / g 0.063 μg / g solution, even with low levels of accumulation and translocation P. parviflora showed signs of a higher tolerance to arsenic compared to the other species, In view that the species managed to survive in the different concentrations. Further studies are needed to verify its capacity and physiological characteristics regarding the mechanism of absorption of the plant and the detail of its behavior in arsenic-contaminated medium. |
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