Evaluación de efectos toxicológicos del cianuro en Daphnia magna
For many years, freshwater bodies have been the direct or indirect recipients of wastewater created by man made activities. In Ecuador, mining activity has increased considerably in recent years, in which cyanide is used in the gold leaching process. The fact of the high toxicity of this metal makes...
Gorde:
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| Formatua: | bachelorThesis |
| Hizkuntza: | spa |
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2020
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| Gaiak: | |
| Sarrera elektronikoa: | http://dspace.udla.edu.ec/handle/33000/12067 |
| Etiketak: |
Etiketa erantsi
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Etiketa erantsi | Gaia: | For many years, freshwater bodies have been the direct or indirect recipients of wastewater created by man made activities. In Ecuador, mining activity has increased considerably in recent years, in which cyanide is used in the gold leaching process. The fact of the high toxicity of this metal makes it a risky compound to treat if it is not with caution and adequately, if the extraction process is defective the consequences are reflected in the environment, for this reason, the purpose of this investigation was to evaluate the toxicological consequences of cyanide in Daphnia Magna. For this test, synthetic water NaCN was used with the concentration of: T1 0.1 mg / L, T2 0.01 mg / L, T3 0.005 mg / L, and mine water containing cyanide and heavy metal remains leaching in concentrations of: T4 0.1 mg / L, T5 0.01 mg / L, T6 0.005 mg / L and T7 control, water still. The concentrations of treatments 1, 2, 4 and 5 were taken based on the provisions of TULSMA and its current environmental regulations, Book VI, Annex 1. For treatments 3 and 6, previous studies and their results were considered. Five repetitions were performed for each treatment and 10 replications for each repetition in 50 ml beakers, for which lethal effects, that is to say, mortality, and other sublethal ones such as mobile capacity after 3 hours and reproduction were analyzed after 2 days. In toxicological tests against sodium cyanide, the results obtained on aspects of mortality and reproduction reflected negative results in treatment 1 and 4 0.1 mg / L since all individuals died before 24 hours. In terms of mobility in the 6 treatment, except in the witness, the water fleas had lethargy. In this way, it was shown that the greater the concentration and the longer the exposure time of sodium cyanide, the greater the negative effects it causes in Daphnia Magna. |
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