Bibliographic citations
Castañeda, E., (2023). Potencial Fitorremediador de las especies Pistia Stratiotes y Eichhornia Crassipes en la remoción de Cromo Hexavalente en solución acuosa [Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/5723
Castañeda, E., Potencial Fitorremediador de las especies Pistia Stratiotes y Eichhornia Crassipes en la remoción de Cromo Hexavalente en solución acuosa []. PE: Universidad Nacional Agraria La Molina; 2023. https://hdl.handle.net/20.500.12996/5723
@mastersthesis{renati/249209,
title = "Potencial Fitorremediador de las especies Pistia Stratiotes y Eichhornia Crassipes en la remoción de Cromo Hexavalente en solución acuosa",
author = "Castañeda Osorio, Edson Vicente",
publisher = "Universidad Nacional Agraria La Molina",
year = "2023"
}
In the present study, the phytoremediation potential of Pistia stratiotes and Eichhornia crassipes species was evaluated by exposing them to 2, 5, 10 and 100 ppm Cr(VI) over a period of 15 days. The experimental units consisted of pots containing 1L of Cr(VI) solution prepared in the laboratory, enriched with hydroponic solution. The determination of Cr(VI) in water was performed by diphenylcarbazide colorimetry and the concentration of chromium in plant tissues was found by atomic absorption spectroscopy. Apparently normal growth was observed at concentrations of 2 and 5 ppm, however, at 10 ppm both species showed significant damage (wilting, chlorosis, necrosis, etc.) being Pistia stratiotes the most affected; at 100 ppm concentration Eichhornia crassipes was the only one that survived in the indicated period, but with severe damage. The relative growth rates at 10 ppm were 0,028 and 0,043 for Pistia stratiotes and Eichhornia crassipes as opposed to 0,107 and 0,084 obtained for both species without exposure to the metal. The highest Cr(VI) removal was obtained in Eichhornia crassipes with removal percentage of 95,66% and 99,82% for 5 and 10 ppm respectively compared to Pistia stratiotes with 77,23 % and 85,03% respectively. The highest calculated bioconcentration factors corresponded to roots. The highest values were those of Eichhornia crassipes, between 144,06 to 157,31 for the aerial part and 761,50 to 835,76 for the roots as opposed to Pistia stratiotes which had values between 61,11 to 108,01 for the aerial part and 592,08 to 743,44 for the roots respectively. Both had translocation factors less than 1, indicating a greater capacity for chromium accumulation in the roots. It is concluded that both species are bioaccumulators of Cr(VI) in aqueous solution, with Eichhornia crassipes showing better results in the process.
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