Determinación de cadmio mediante voltametría de onda cuadrada en aguas residuales de mina vertidas en la quebrada el panteón

Abstract

This research addresses the issue of heavy metal contamination in mine wastewater, with the main objective of determining the concentration of cadmium in the El Panteon stream, located in the province of El Oro, Santa Rosa canton, applying the technique of square wave voltammetry. A methodology with a descriptive and analytical approach was proposed. The VOC method consists of measuring the current in short time intervals, generating a voltagram with a symmetrical peak. The population was the water that flows into the Santa Rosa River micro-basin, and four sampling points were selected for the sample: the water catchment in Torata, the water discharge in the Torata Mining and Tabito mining concessions, and finally, in the El Panteón stream. Samples were taken in triplicate for the analysis, which were taken on two consecutive days. According to the analysis performed, it is concluded that the discharge water at the Tabito Mining Concession has a higher Cd concentration of 0.31ppm, which occurs when leachates are disposed of without prior wastewater treatment as required by Ecuadorian regulations. In addition, according to the results obtained, it is determined that the four sampling points exceed the permissible Cd limits established in the Regulations to the Environmental Management Law for the Prevention and Control of Environmental Contamination, TULSMA (Unified Text of Secondary Environmental Legislation) Book VI, Annex 1.