Determinación de metales pesados en sedimentos de las lagunas Colta y Magtayán

This work aimed to examine the presence of heavy metals in sediments from the Colta and Magtayán lagoons during the dry and rainy seasons. First, the anthropogenic activities around the three sites of the Colta (7B1, 7B2, 7B3) and Magtayán (7A1, 7A2, 7A3) lagoons were characterized using direct observation. So, six human activities were identified: agriculture, livestock, sport fishing, tourism, heavy machinery, wastewater, and solid waste. The physicochemical parameters of the sediment samples collected in the mentioned places, such as texture, structure, humidity, density, porosity, conductivity, pH, and organic matter, were also analyzed. These parameters underwent testing for the analysis of variance. As a result, there were notable discrepancies discovered. In addition, atomic absorption spectrophotometry was used to quantify the amount of heavy metals in sediments. The results indicated the presence of iron, manganese, and zinc, unlike the elements cadmium, nickel, lead, and copper themselves, which were not detectable due to the minimum detection limit of the spectrophotometer. The three elements' results reported that zinc is the metal found in the lowest proportion with concentrations from 0.00 ppm to 22.39 ppm. Manganese follows with concentrations from 48.52 ppm to 683.231 ppm. Finally, iron is the metal that presented the highest concentration, from 106.67 ppm to 9822.48 ppm, these concentrations were compared with regulations and maximum permissible limits established by international organizations, and it was determined that the attention of iron in the Colta lagoon exceeded the boundaries of the Mexican and Chilean regulations. In contrast, the Argentine regulations did not exceed them. In the Magtayán lagoon, iron concentrations did not exceed the limits of Mexican and Chilean environmental regulations. Zinc concentrations did not exceed the boundaries of the regulations used. Regarding manganese, concentrations in the Colta lagoon did not exceed the limits of Mexican, Canadian, and US regulations. In the Magtayán lagoon, manganese concentrations exceeded Canadian and US regulatory limits but not Mexican regulatory limitations.

• Main Author: Illapa Apugllón, Joel Vinicio (author)
• Other Authors: Betún Guaman, Cristian Alexander (author)
• Format: bachelorThesis
• Language: spa
• Published: 2023
• Subjects: Análisis de varianza; Lagunas Andinas; Análisis fisicoquímico
• Online Access: http://dspace.unach.edu.ec/handle/51000/11416