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http://dspace.udla.edu.ec/handle/33000/11553| Tipo de material : | bachelorThesis |
| Título : | Efectos toxicológicos del cromo, sobre Daphnia magna |
| Autor : | Jácome Maldonado, Daniela Alejandra |
| Tutor : | Black Solís, Indira Fernandina |
| Palabras clave : | CONTAMINACIÓN DEL AGUA;AGUAS RESIDUALES;TOXICIDAD DEL AGUA;CROMO |
| Fecha de publicación : | 2019 |
| Editorial : | Quito: Universidad de las Américas, 2019 |
| Citación : | Jácome Maldonado, D. A. (2019). Efectos toxicológicos del cromo, sobre Daphnia magna (Tesis de pregrado). Universidad de las Américas, Quito. |
| Resumen : | Las descargas incontroladas de aguas residuales a los cuerpos de agua se dan por la falta de planificación tanto tecnológica como industrial y además de una inapropiada zonificación... |
| Descripción : | Uncontrolled discharges of wastewater to water bodies occur due to lack of planning in both, technology and industry, in adittion, proper zoning. In Ecuador, the Cutuchi River that is located in the cities of Lasso and Latacunga captures the contaminating discharges of different industries, including the tannery industry. The objective of this study is to evaluate the toxicological effects of chromium on Daphnia magna. Synthetic water, prepared in the laboratory, was used and the following concentrations were used: T1 (control, standing water), T2 (0.03 mg/L), T3 (0.038 mg/L), T4 (0.1 mg/L), T5 (0.2 mg/L), T6 (0.684 mg/L), T7 (0.8 mg/L) y T8 (1 mg/L). Treatment concentrations 2, 3 and 6 were taken based on the results in the Cutuchi River, T3 represents the maximum allowable chromium for the preservation of aquatic life in freshwater bodies and the others were established by means of preliminary tests. The basic chromium sulfate- Cr (OH) SO4 was occupied and five repetitions were performed per treatment in 100 ml vessels and 10 replicates for each repetition. Lethal effects were analyzed at 24, 48 y 72 hours and sublethal effects (mobility) at 6 hours and reproduction (at 20 days). According to the results obtained, mortality and reproduction had negative effects with T8 (1 mg/L), however, mobility was altered (lethargy) in all treatments except in the control, so evidence that Daphnia magna presents significant effects as chromium concentration increases and the number of days of exposure. |
| URI : | http://dspace.udla.edu.ec/handle/33000/11553 |
| Aparece en las colecciones: | Ingeniería Ambiental en Prevención y Remediación |
Ficheros en este ítem:
| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| UDLA-EC-TIAM-2019-37.pdf | 2 MB | Adobe PDF | Visualizar/Abrir |
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